All About Fix Error 0xc1900101 on Windows 11 Installation Assistant

All About Fix Error 0xc1900101 on Windows 11 Installation Assistant

Windows 11 has been highly anticipated by users worldwide, promising an upgraded and improved Windows experience. However, with the excitement of a new operating system comes a few obstacles, including installation errors. One of the most common errors encountered during installation is the 0xc1900101 error. This error can cause frustration and confusion, hindering the smooth installation of Windows 11. In this article, we will delve into all the details of this error, its causes, and provide solutions on how to fix it using the Windows 11 Installation Assistant. By the end of this article, you will have a clear understanding of how to troubleshoot and resolve this error, allowing you to complete the installation process smoothly.

How to Fix ‘Error 0xc1900101’ on Windows 11 Installation Assistant?

Are you trying to install Windows 11 on your device but keep getting an error code 0xc1900101? This error code commonly appears when there is a problem with the installation process or system compatibility. It can be frustrating to encounter this error, but don’t worry because there are a few steps you can take to fix it and successfully install Windows 11. In this article, we will discuss how to fix error 0xc1900101 on the Windows 11 installation assistant.

Method 1: Update Drivers
The first step is to ensure that all your device drivers are up to date. Outdated drivers can cause incompatibility issues with the Windows 11 installation. To update your drivers, follow these steps:

1. Press the Windows key + R to open the Run command.

2. Type “devmgmt.msc” and press Enter to open the Device Manager.

3. In the Device Manager, expand each category and right-click on each device to select “Update Driver.”

4. Select “Search automatically for updated driver software” and let the process complete.

5. Repeat this process for every device and restart your computer.

Method 2: Disable Antivirus Software
Your antivirus or firewall software may be interfering with the Windows 11 installation process, causing the 0xc1900101 error. To fix this issue, temporarily disable your antivirus software and try the installation again.

1. Right-click on the Antivirus/Firewall icon in your system tray.

2. Select the option to disable the software. If you’re using Microsoft Defender, go to Settings > Update & Security > Windows Security > Virus & threat protection and toggle the Real-time protection switch to Off.

3. Once the installation is complete, remember to re-enable your antivirus software.

Method 3: Run Windows Update Troubleshooter
If your system is not fully up to date, it can cause compatibility issues with the Windows 11 installation. To fix this, run the Windows Update Troubleshooter.

1. Press the Windows key + I to open Settings.

2. Go to Update & Security > Troubleshoot.

3. Select Windows Update and click on “Run the troubleshooter.”

4. Follow the on-screen instructions to complete the troubleshooter.

Method 4: Perform a Clean Boot
A clean boot will start your computer with the minimum set of drivers and programs needed to run. This can help identify any software conflicts that may be causing the 0xc1900101 error.

1. Press the Windows key + R to open the Run command.

2. Type “msconfig” and press Enter to open the System Configuration.

3. Go to the Services tab and select “Hide all Microsoft services.”

4. Click on “Disable all” and then go to the Startup tab.

5. Click on “Open Task Manager” and disable all the startup items from the list.

6. Close the Task Manager and click on OK in the System Configuration window.

7. Restart your computer and try the Windows 11 installation again.

Method 5: Use a System File Checker
The System File Checker (SFC) is an inbuilt Windows tool that helps scan and fix corrupted system files, which can cause the 0xc1900101 error.

1. Press the Windows key + X and select “Command Prompt (Admin).”

2. Type “sfc /scannow” and press Enter.

3. The process can take some

Uninstall Third-Party Antivirus

Uninstalling third-party antivirus software can sometimes be necessary for various reasons. It could be because you want to switch to a different antivirus program, or because the current one is causing issues on your computer. Whatever the reason may be, uninstalling the antivirus software correctly is crucial to avoid any further problems. In this blog, we will discuss the steps to uninstall third-party antivirus software.

Step 1: Disable real-time protection
Before you begin the uninstallation process, it is important to disable the real-time protection of your antivirus software. This will prevent any interference while you are uninstalling the program. To do this, right-click on the antivirus icon in the system tray and select the option to disable real-time protection.

Step 2: Uninstall from Control Panel
The most common way to uninstall any third-party software is through the Control Panel. To do this, go to the Start menu and type “Control Panel” in the search bar. Once the Control Panel opens, click on “Programs and Features” or “Uninstall a program” depending on your Windows version. Scroll through the list of programs and select the third-party antivirus software. Click on “Uninstall” and follow the instructions to complete the process.

Step 3: Run the antivirus software’s removal tool
Some antivirus programs come with a specific removal tool that needs to be run to completely uninstall the software. Check the official website of the antivirus software for any instructions on how to use the removal tool. You can also search for the removal tool on the internet and download it from a trusted source.

Step 4: Remove leftover files
After uninstalling the antivirus software, it is important to remove any leftover files or registry entries to avoid any conflicts. To do this, open the Run dialog box by pressing the Windows key + R and type “regedit” in the box. Press Enter and the Registry Editor will open. Navigate to HKEY_CURRENT_USER > Software and delete any folders related to the antivirus software.

Step 5: Restart your computer
After completing all the steps, it is recommended to restart your computer to ensure that the uninstallation is complete and there are no more leftovers.

In conclusion, uninstalling third-party antivirus software requires a few simple steps to ensure a clean removal. It is important to follow these steps carefully to avoid any issues. If you are planning to switch to a different antivirus program, make sure to download and install it after completely removing the previous one.

Remove BitLocker or Any Other Encryption

Remove BitLocker or Any Other Encryption

As the need for data security becomes increasingly important in our digital age, encryption has become a commonly used method to protect sensitive information. BitLocker is a type of encryption software developed by Microsoft that is used to secure data on Windows operating systems. It is commonly used by individuals, businesses, and organizations to prevent unauthorized access to their data.

While BitLocker and other encryption methods can provide strong protection for your data, there may come a time when you need to remove it. This may be due to the need to transfer data to a non-encrypted device, or simply due to changing security needs. In this blog post, we’ll discuss how to remove BitLocker or any other encryption from your device.

Step 1: Backup Your Data

Before proceeding with the removal of BitLocker or any other encryption, it is vital to back up all important data stored on the encrypted device. This is an essential step as the encryption removal process may lead to data loss, and having a backup will ensure that you do not lose any important information.

Step 2: Identify the Type of Encryption

Different types of encryption have different methods for removal. In the case of BitLocker, there are two types of encryption: Full Disk Encryption (FDE) and Volume Encryption (VE). FDE encrypts the entire hard drive, while VE only encrypts select volumes. It is important to know which type of encryption your device has before attempting to remove it.

Step 3: Unlock the Encrypted Drive

To remove BitLocker or any other encryption from your device, you first need to unlock the encrypted drive. If you are using BitLocker, you can do this by entering the password or recovery key that you set up during the initial encryption process. If you are using a different type of encryption, refer to the specific software’s documentation for instructions on how to unlock the drive.

Step 4: Turn Off BitLocker or Other Encryption

Once the drive is unlocked, you can proceed to turn off BitLocker or any other encryption. In the case of BitLocker, you can do this by accessing the BitLocker Drive Encryption settings in the Control Panel and selecting “Turn off BitLocker.” If you are using a different type of encryption, consult the software’s documentation for instructions on how to turn it off.

Step 5: Decrypt the Drive

After turning off the encryption, you may need to decrypt the drive. This step may differ depending on the type of encryption you used. In the case of BitLocker, you can decrypt the drive by right-clicking on the encrypted drive in File Explorer, selecting “Manage BitLocker,” and then clicking on “Turn off BitLocker.” This will decrypt the drive and remove the encryption.

Step 6: Test the Drive

After removing the encryption, it is essential to test the drive to ensure that the data is accessible and there are no issues. Check that all data is present and readable before deleting the backup files.

In conclusion, encryption is an essential part of data security, but there may be instances where you need to remove it. Following these steps will guide you through the process of removing BitLocker or any other encryption from your device, ensuring that your data is accessible and secure. Remember to always backup your data before attempting any encryption removal.

Disable RealTek Drivers

This guide will help you to completely disable Realtek drivers in Windows 10.

Realtek is a manufacturer of audio and network hardware, and their drivers are commonly used in many computers. However, sometimes these drivers can cause issues and you may want to disable them. Here’s how you can disable Realtek drivers in Windows 10:

1. Open Device Manager
To open Device Manager, right-click on the Start button and select “Device Manager” from the list.

2. Locate the Realtek drivers
Expand the “Sound, video and game controllers” section and look for any drivers with “Realtek” in the name. It could be listed as “Realtek High Definition Audio” or “Realtek PCIe GBE Family Controller” for example.

3. Disable the drivers
To disable a driver, right-click on it and select “Disable device” from the context menu. If there are multiple Realtek drivers, repeat this process for each one.

4. Confirm the action
You will be prompted to confirm the action. Click “Yes” to proceed.

5. Restart your computer
After disabling the drivers, it is recommended to restart your computer for the changes to take effect.

6. Verify the drivers are disabled
Once your computer has restarted, open Device Manager again and check if the Realtek drivers are disabled. If they are still listed, repeat steps 3 and 4 to disable them again.

Why disable Realtek drivers in Windows 10?

There could be numerous reasons why you want to disable Realtek drivers in Windows 10. Some users have reported audio issues with Realtek drivers, such as sound cutting out or crackling noises. Disabling these drivers may help to resolve such problems.

Other reasons could include compatibility issues with other hardware or software on your computer, or you may simply prefer to use a different audio or network driver.

What happens when you disable Realtek drivers?

When you disable Realtek drivers, your computer will no longer use them for audio or network functions. Instead, it will use the default Windows drivers or any alternate drivers you have installed.

Keep in mind that disabling Realtek drivers may affect the performance or functionality of your hardware. If you experience any issues, you can always re-enable the drivers by following the same steps and selecting “Enable device” instead.

In conclusion, disabling Realtek drivers in Windows 10 is a simple process that can be done through Device Manager. It may improve the performance of your computer or resolve any issues you may be experiencing with the drivers. However, it is important to note that disabling these drivers can also have a negative impact, so it should be done with caution.

Uninstall .NET Feature

Uninstalling .NET feature on your computer may be necessary for several reasons such as fixing software conflicts, freeing up disk space, or upgrading to a newer version of .NET. Here’s a step-by-step guide on how to uninstall .NET feature on Windows.

Step 1: Open Control Panel
The first step is to open the Control Panel on your computer. You can do this by clicking on the Windows Start button and typing “Control Panel” in the search bar. Once the Control Panel appears, click on it to open it.

Step 2: Click on Programs
In the Control Panel, click on “Programs” or “Programs and Features” depending on your version of Windows. This will open a list of all the installed programs on your computer.

Step 3: Select .NET Feature
Scroll down the list of programs and locate the .NET feature that you want to uninstall. It may have different names depending on your version of Windows, such as .NET Framework, .NET Core, or .NET runtime. Click on the feature to select it.

Step 4: Click on Uninstall
Once you have selected the .NET feature, click on the “Uninstall” button at the top of the list. This will open a prompt asking for confirmation to uninstall the feature. Click “Yes” to proceed.

Step 5: Follow the Uninstallation Wizard
The next step is to follow the on-screen instructions provided by the .NET feature’s uninstallation wizard. It will guide you through the process and ask for confirmation before making any changes to your system. Make sure to read and follow the prompts carefully.

Step 6: Restart Your Computer
After the uninstallation process is complete, it is recommended to restart your computer. This will ensure that all changes are applied and any remaining files or settings related to the .NET feature are removed.

Congratulations, you have successfully uninstalled the .NET feature from your computer. You can now install a newer version or use alternative software that does not require .NET.

In case you encounter any issues, you can also try using the Microsoft .NET Repair Tool, which is designed to fix common .NET framework installation problems. It can also be used to uninstall the .NET feature if the standard method does not work.

In conclusion, while .NET is an essential component for many applications, there may be times when you need to uninstall it from your system. By following the above steps, you can easily remove the .NET feature and resolve any related conflicts or issues on your computer.

Change Secure Boot OS Type

Change Secure Boot OS Type

Secure Boot is a feature that is implemented in modern computer systems to protect the boot process from malicious attacks. It ensures that only trusted software is allowed to run during the boot process, preventing malware and other threats from compromising the system.

One of the key settings in Secure Boot is the OS type, also known as the Boot Mode, which defines the type of operating system that is allowed to run during the boot process. By default, Secure Boot is set to “UEFI” (Unified Extensible Firmware Interface) mode, which supports newer operating systems that use UEFI instead of the traditional BIOS.

However, if you want to install an older or alternative operating system, such as Linux, that uses BIOS instead of UEFI, you will need to change the Secure Boot OS type to “Legacy” or “CSM” (Compatibility Support Module) mode. This will allow the system to boot from a traditional BIOS-based bootloader.

To change the Secure Boot OS type, you will need to access your computer’s BIOS or UEFI settings. The process for accessing these settings may vary depending on your system, but it typically involves pressing a key (such as F2, F10, or Del) during the boot process. Consult your computer or motherboard manual for specific instructions.

Once you have accessed the BIOS or UEFI settings, navigate to the Secure Boot menu. From here, you should see an option to change the OS type or Boot Mode. Select the appropriate option (UEFI for newer operating systems or Legacy/CSM for older operating systems) and save your changes.

It is important to note that changing the Secure Boot OS type may disable some security features and may even prevent your system from booting if a non-UEFI compatible operating system is installed. Make sure to research and understand the potential risks and consequences before making any changes.

In conclusion, changing the Secure Boot OS type is necessary when installing an older or alternative operating system that does not support UEFI. However, it is important to understand the potential risks and consequences associated with this change before proceeding.

Update BIOS

BIOS (Basic Input/Output System) refers to the firmware that is responsible for starting up your computer and initializing various components like hardware, operating system, etc. It is stored on a chip on the motherboard and is the most important software on your computer as it controls everything from the moment you press the power button.

As technology constantly evolves, BIOS updates are released periodically to fix bugs, improve compatibility with hardware and software, and add new features. It is important to keep your BIOS up to date to ensure your computer is running at optimal performance and to avoid any potential issues.

Here are 5 steps to update your BIOS:

1. Identify the motherboard manufacturer and model: You can find this information by checking the documentation that came with your computer or by using system information tools like CPU-Z.

2. Visit the manufacturer’s website: Once you have identified the motherboard model, visit the manufacturer’s website to find the latest BIOS update for your specific model.

3. Download and save the BIOS update: Make sure to download the correct update for your motherboard model and save it to a USB drive or a CD.

4. Backup your current BIOS settings: Before proceeding with the update, it is always recommended to backup your current BIOS settings. You can usually find this option in the BIOS menu itself.

5. Update the BIOS: Restart your computer and press the designated key (usually F2 or Del) to enter the BIOS menu. Look for an option to update the BIOS and follow the instructions on the screen. The process may take a few minutes and your computer will restart once the update is complete.

It is important to note that updating the BIOS is a delicate process and if not done properly, it can cause irreversible damage to your computer. Therefore, it is recommended to follow the manufacturer’s instructions carefully and to only update the BIOS if necessary. It is also recommended to have a stable power supply during the update process to avoid any interruptions.

In conclusion, updating the BIOS can improve your computer’s performance and fix any issues, but it should be done with caution. If you are not familiar with the process, it is best to seek professional help to avoid any potential risks. Additionally, keep in mind that updating the BIOS should not be considered as a solution to all computer problems, and it is important to troubleshoot any issues before proceeding with the update.

Clean Install Windows 11

Windows 11 is the latest and most advanced operating system by Microsoft. It offers a wide range of new features and improvements to enhance the user experience. One of the best ways to experience these new features and improve the overall performance of your system is by performing a clean install of Windows 11.

A clean install is also known as a “fresh” or “custom” install, as it involves completely wiping out the existing operating system and installing a new one from scratch. This means that all the settings, files, and applications on your computer will be deleted, so be sure to backup your important data before proceeding with the clean install.

Here’s a step-by-step guide on how to perform a clean install of Windows 11:

Step 1: Create a Bootable Installation Media

To install Windows 11, you will need a bootable installation media, which can be a USB drive or a DVD. You can create one using the Windows Media Creation Tool or Rufus. Make sure to use a reliable and fast USB drive or DVD for this process.

Step 2: Boot from the Installation Media

Insert the bootable installation media into your computer and restart it. As the computer restarts, enter the BIOS settings (usually by pressing a function key like F2 or Delete) and change the boot priority to the USB drive or DVD. Save the changes and exit the BIOS settings. Your computer will now boot from the installation media.

Step 3: Install Windows 11

Once your computer is booted from the installation media, you will see a Windows setup screen. Follow the instructions to select your language, time and currency format, and keyboard layout. Click on the “Install Now” button to start the installation.

Step 4: Enter Product Key and Select Edition

You will be asked to enter the product key for Windows 11. If you have a genuine product key, enter it here. If you don’t have a product key, you can skip this step and proceed with the installation. Next, select the edition of Windows 11 you want to install. Click on “Next” to continue.

Step 5: Accept License Terms and Choose Installation Type

Read and accept the license terms, then click on “Next”. Now, you have to choose the type of installation. Select “Custom: Install Windows only (advanced)” as we are performing a clean install. This will wipe out all the existing files and install a new copy of Windows 11.

Step 6: Format the Hard Drive and Install Windows 11

Here, you will see a list of partitions on your hard drive. Select the partition where you want to install Windows 11 and click on “Format”. This will erase all the data on that partition. Once formatted, click on “Next” to start the installation process. It may take some time to complete, so be patient.

Step 7: Set Up Your Account and Complete Installation

After the installation is completed, you will be prompted to set up your account and basic settings, such as computer name and password. Follow the instructions and complete the setup. Once done, you will be logged into your new Windows 11 desktop.

Congratulations, you have successfully performed a clean install of Windows 11. You can now experience the new features and improved performance of the latest Microsoft operating system. Make sure to install all the necessary drivers and programs to get the full benefit of Windows 11.


In conclusion, fix error 0xc1900101 on Windows 11 Installation Assistant is a common issue faced by many users while installing the new operating system. By following the solutions mentioned in this article, such as updating drivers and disabling antivirus software, users can easily resolve this error and successfully install Windows 11. It is important to note that this error can also occur due to hardware issues, so it is recommended to check the system’s compatibility before attempting to install the new OS. With these steps in mind, users can smoothly upgrade to Windows 11 without any hassle.

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