All About Fix Unarc.dll returned an error code in Windows 10/11

All About Fix Unarc.dll returned an error code in Windows 10/11

Are you experiencing issues with the Unarc.dll error code on your Windows 10/11? Are you unsure of what this error means and how to fix it? Look no further, as we delve into all the essential information about the Unarc.dll error code, including its causes, implications, and, most importantly, how to solve it on your Windows 10/11 operating system. Whether you are a tech-savvy individual or a novice PC user, this article will provide you with all the necessary knowledge to resolve the Unarc.dll error code efficiently. Keep reading to learn all about fixing Unarc.dll returned an error code in Windows 10/11.

Fix: ‘Unarc.dll returned an error code’ in Windows 10/11

If you are facing the error message “Unarc.dll returned an error code” while trying to install a program, don’t worry, you are not alone. Many users have reported this error on their Windows 10/11 PCs. This error can occur due to various reasons, such as corrupted system files, missing or damaged DLL files, insufficient disk space, or incompatible installation files. But don’t worry, in this article, we will discuss some solutions that can help you fix this error.

Solution 1: Re-download the installation files

One of the most common reasons for “Unarc.dll returned an error code” is corrupted or incomplete installation files. In such a case, you can try to download the installation package again from a trusted source and then try to install the program.

Solution 2: Check for system file errors

Corrupted system files can also lead to this error. To fix this, you can use the built-in System File Checker (SFC) tool that checks for and repairs corrupted system files.

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

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

3. Wait for the process to complete, and then restart your computer.

4. Try installing the program once again.

Solution 3: Run a disk cleanup

Insufficient disk space can also cause this error. Running a disk cleanup can help you free up some space on your hard drive and fix this error. To do this, follow the steps below:

1. Press the Windows key + R to open the Run dialog box.

2. Type “cleanmgr” and press Enter.

3. Select the drive where you want to run the cleanup and click OK.

4. Check all the boxes (including “System files” and “Temporary files”) and click OK.

5. Click on the “Clean up system files” button.

6. Once the process is complete, restart your computer and try installing the program again.

Solution 4: Re-register the DLL files

If the “Unarc.dll returned an error code” message specifies a particular DLL file, you can try re-registering it using the Command Prompt. Here’s how:

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

2. Type the following commands, pressing Enter after each one:

regsvr32 D:\unarc.dll (replace “D” with the letter of the drive where the DLL file is located)

regsvr32 D:\unarc.dll /u

regsvr32 D:\unarc.dll (again)

3. Try installing the program again.

Solution 5: Update your drivers and Windows

Outdated drivers or an older version of Windows can also lead to this error. Make sure you have the latest drivers and updates installed on your system. You can do this by going to Settings > Update & Security > Windows Update.

Solution 6: Perform a clean boot

If none of the above solutions work, you can try performing a clean boot. This will disable all unnecessary programs and services that may be interfering with the installation process.

1. Press the Windows key + R to open the Run dialog box.

2. Type “msconfig” and press Enter.

3. In the System Configuration window, go to the Services tab.

4. Check the box next to “Hide all Microsoft services.”

5. Click on “Disable all.”


1. Clean all the Temporary Files from the System

As we use our computers and devices on a daily basis, temporary files can start to pile up and take up valuable storage space. These files are created by the operating system and various applications and can accumulate over time without us even realizing it. Not only do these temporary files take up storage space, but they can also slow down our system’s performance. However, with a few simple steps, we can easily clean out all the temporary files from our systems.

1. Use Disk Cleanup Tool
The first and easiest method to remove temporary files is by using the built-in Disk Cleanup tool in Windows. This tool helps to scan and delete unnecessary files from our system, including temporary files. To do this, go to the Start menu and type “Disk Cleanup” in the search bar. Click on the app to open it. From there, select the drive you want to clean (usually the C drive) and click “OK.” The tool will then scan your drive and present a list of files to delete. Make sure to mark the “Temporary Files” option and click “OK” to delete them.

2. Manually Delete Temporary Files
If you want a more thorough clean, you can also manually delete temporary files. These files are usually stored in the “Temp” folder on your computer. To access this folder, type “%temp%” (without quotes) in the search bar and press Enter. This will open the Temp folder, and you can select and delete all the files in it. However, make sure not to delete any system files or folders as it may cause problems.

3. Use a Third-Party Tool
If you prefer a more automated and efficient way to clean temporary files, you can use a third-party tool such as CCleaner or CleanMyPC. These tools are specifically designed to scan and remove all types of temporary files, including internet browser cache, system files, and application cache. They also have additional features such as optimizing system performance and managing startup items.

4. Clear Browser Cache
Our web browsers also store temporary files, known as caches, which help speed up our browsing experience. However, these files can accumulate over time and take up considerable space on our devices. To clear browser cache, open your preferred browser and go to the settings or options menu. From there, find the option to clear browsing data or history and make sure to select “Cached images and files” before clicking “Clear data.”

5. Regularly Schedule Cleanups
To keep our systems clutter-free, it is essential to clean out temporary files regularly. You can schedule a weekly or monthly cleanup using any of the methods mentioned above. This will help maintain the performance and storage space of your device.

In conclusion, by regularly cleaning temporary files from our systems, we can improve its performance, free up valuable storage space, and ensure the smooth functioning of our devices. Whether it’s through built-in tools or third-party software, these quick and easy steps can help keep our systems clean and optimized.

2. Download the Missing DLL file

2. Download the Missing DLL file

As technology continues to advance and evolve, we are increasingly relying on various software programs to perform daily tasks. However, at times, these programs can encounter errors that can disrupt their functioning. One of the most common errors is the missing DLL file error.

A DLL (Dynamic Link Library) file is a set of instructions that multiple programs can use to perform specific functions. DLL files allow programs to save space by not requiring the same code to be present in multiple applications. Therefore, when a program requires a DLL file to function, and it is missing, the program will display a “missing DLL file” error message.

What Causes DLL File Errors?

There can be multiple reasons behind a missing DLL file error. Some of the most common ones include:

1. Outdated or corrupt drivers – Drivers are essential for the proper functioning of hardware and software on our computers. Outdated or corrupt drivers can result in missing DLL files.

2. Incomplete installation or uninstallation of a program – If a program is not installed or uninstalled correctly, it can leave behind some DLL files, leading to error messages.

3. Malware or virus infection – Malware or virus attacks can corrupt or delete DLL files, resulting in missing DLL file errors.

4. Hardware failure – A failing hard drive or RAM can cause DLL files to become corrupted or go missing.

How to Download the Missing DLL File

If you encounter a missing DLL file error, there are several methods you can try to fix it. These include:

Method 1: Reinstall the Program

If the missing DLL file is for a specific program, try reinstalling the program to see if it resolves the error. Sometimes, during the installation, the program can encounter issues that lead to missing DLL files.

Method 2: Download the DLL File from a Reputable Source

Many websites offer DLL files for download. However, some of these websites may not be trustworthy, and the downloaded file may contain viruses or malware. Therefore, it is essential to download the DLL file from a reputable and reliable source.

You can go to websites such as or to download the missing DLL file. These websites have dedicated libraries of DLL files that you can search for and download.

Method 3: Use System File Checker (SFC) Tool

The System File Checker tool is a built-in utility in Windows that allows users to scan and repair corrupt or missing system files. To use this tool, follow these steps:

1. Open the Command Prompt as an administrator by searching for it in the Start menu and right-clicking on it. Select “Run as administrator.”

2. In the Command Prompt, type “sfc /scannow” and hit Enter.

3. The SFC tool will now scan your system for missing or corrupt system files, including DLL files, and attempt to repair them.

4. Once the process is complete, restart your computer and check if the error has been resolved.

Method 4: Use a System Restore Point

If the error occurred recently, you can try using a System Restore point to revert your computer’s settings to a time when the DLL file was present. To use this method, follow these steps:

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

2. Type “rstrui” and hit Enter.

3. The System Restore window will appear. Click on “Next.”

4. Select the restore point you want to use and click “Next

5. Use Regsvr32 Tool for Re-registration of Unarc.dll File

If you have encountered an error message stating “Unarc.dll is missing” while trying to install a program or game, do not panic. This error can easily be fixed by re-registering the Unarc.dll file using the Regsvr32 tool. This tool is a command-line program that can be found in the Windows operating system and is used for registering or un-registering Dynamic Link Libraries (DLLs) and ActiveX controls. In this blog post, we will discuss the steps to re-register the Unarc.dll file using the Regsvr32 tool.

Step 1: Access the Command Prompt

The first step is to open the Command Prompt on your computer. You can do this by typing “cmd” in the search bar and clicking on the Command Prompt application. Alternatively, you can also press the Windows + R keys on your keyboard and type “cmd” in the Run dialog box.

Step 2: Navigate to the Unarc.dll File Location

Once you have opened the Command Prompt, you need to navigate to the location where the Unarc.dll file is stored. To do this, type “cd” followed by the file path in the Command Prompt. For example, if the Unarc.dll file is located in the “C:\Windows\System32” folder, type “cd C:\Windows\System32” and press Enter.

Step 3: Re-register the Unarc.dll File

Next, you need to re-register the Unarc.dll file using the Regsvr32 tool. To do this, type “regsvr32 unarc.dll” in the Command Prompt and press Enter. If the file is successfully registered, you will see a message saying “DllRegisterServer in unarc.dll succeeded.”

Step 4: Restart your Computer

After re-registering the Unarc.dll file, it is recommended to restart your computer for the changes to take effect.

Step 5: Check for Errors

Once your computer has restarted, try to install the program or game that was giving you the “Unarc.dll is missing” error. If the error still persists, it is possible that the file is corrupted or damaged. In this case, you can try downloading a new version of the file from a reliable source and repeating the above steps.

In conclusion, the Regsvr32 tool can be a useful tool for fixing “Unarc.dll is missing” errors. However, if the error persists, it is recommended to seek help from a professional or contact the software developer for further assistance. We hope this blog post was helpful in resolving the issue.


In conclusion, understanding the root cause of the “Unarc.dll returned an error code” issue in Windows 10/11 is essential for effectively fixing it. With the various methods mentioned in this article, users can easily troubleshoot and resolve this error. It is important to remember to always update the operating system, drivers, and software to avoid encountering this error in the future. Additionally, regularly performing maintenance tasks such as disk cleanup and registry cleaning can also help prevent any system errors. By following these steps, users can ensure a smooth and error-free experience on their Windows 10/11 devices.

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