How to fix unarc.dll errors in Windows 10

Matthew Adams
by Matthew Adams
Windows & Software Expert
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  • DLL files are critical files necessary for either Windows or other programs to work and execute certain functions. Keeping your computer clean from junk is a good way to prevent damage to these files.
  • If the message unarc.dll file is missing shows when performing an install, make sure Windows Update is turned on, and your drivers are all up-dated. Otherwise, download and copy the file in the right location.
  • Check out DLL Errors section for other similar issues with this type of files.
  • Experiencing other Windows issues? Check out our Windows 10 Errors hub with solutions to these problems.
error 0x80070780 Windows 10
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6 quick solutions to fix unarc.dll

  1. Run a System File Checker Scan
  2. Scan the Registry
  3. Reinstall the Software
  4. Roll Back Windows 10 With System Restore
  5. Check Out DLL Fixer Software
  6. Reset Windows 10

What is Unarc.dll?

Unarc.dll is one of Windows’ DLL (Dynamic Link Library) files that’s needed to run certain programs. A “unarc.dll cannot be found” or “unarc.dll is missing” error message, or something similar, might pop up when the unarc file is missing or corrupted. The exact error messages might vary, but they will all include references to the unarc file.

Some users have stated that a unarc.dll error message pops up when they try to install or run games in Windows 10. Consequently, the games don’t run or install when the error occurs. Counter-Strike, Civilization 5, PlayerUnknown’s Battlegrounds, and Far Cry 4 are just a few of the games that require the unarc file.

This is how users can fix unarc.dll error message in Windows 10.

How do I fix Unarc.dll Errors

1. Run a System File Checker Scan

The System File Checker is one utility that can potentially fix numerous DLL error messages. That utility can repair corrupted DLL system files, such as the unarc.dll. This is how users can run an SFC scan in Windows 10.

  • Click Cortana’s Type here to search taskbar button, and enter ‘cmd’ in the search box.
  • Right-click Command Prompt and select the Run as administrator option.

  • Before running a system file scan, enter ‘DISM.exe /Online /Cleanup-image /Restorehealth’ and press Return.
  • Thereafter, input ‘sfc /scannow’ in the Prompt’s window and press Enter to initiate the SFC scan.

  • The SFC scan might take about 30 minutes. Restart Windows 10 if the Command Prompt states “Windows Resource Protection found corrupt files and successfully repaired them.

Run a third-party DLL fixer

There are plenty of third-party programs out there that promise to fix or replace missing or broken DLLs, and most of them stay true to their word. However, if you are to choose just one, then there’s no way you can go wrong with Restoro.

How to use Restoro to fix missing or broken DLLs

  1. Download here Restoro and install it on your Windows 10 PC
  2. Let Restoro perform a full system scan
  3. When the scan is finished, press Clean Now
    • This is when you will have to activate your license key
    • Before the repair process starts, Restoro will create a restore point of your system in case things go wrong
  4. Restoro will now proceed to fix your DLL-related issue.

Note: While Restoro can be downloaded for free, it has limited functionality until you activate it. That being the case, if you want the full benefit of a great PC repair and optimization tool, you should purchase the full license.

2. Scan the Registry

A unarc file error can be due to invalid registry entries. So some of the best registry cleaner software might fix unarc.dll error messages. Millions of users utilize CCleaner for registry scans and fixes. So that’s one registry cleaner which might fix unarc error messages.

  • To add the freeware CCleaner version to Windows 10, click the Free Download button on the software’s webpage. Then open CCleaner’s setup wizard to install the utility.
  • Run CCleaner and click Registry.

  • Note that the CCleaner registry cleaner includes a Missing Shared DLL check box. Select Missing Shared DLL and all the other check boxes for the most thorough scan.
  • Click the Scan for Issues button.
  • Thereafter, press the Fix Selected Issues button to open a dialog box window.
  • Users can select Yes to back up the registry first if they prefer.
  • Then press the Fix All Selected Issues button shown directly below.

3. Reinstall the Software

When the unarc.dll error message pops up for specific installed game, reinstalling the game could fix the issue. Reinstalling the software will update the target folder with a missing DLL file.

Users can uninstall games and other software by pressing the Windows key + R hotkey, entering appwiz.cpl in Run, selecting the software to remove on the Programs and Features window, and clicking Uninstall. Thereafter, reinstall the game with its disc or by opening its installer from a folder.

4. Roll Back Windows 10 With System Restore

The System Restore utility is a potential resolution for unarc file errors that have come about as a consequence of recent system changes. System Restore will probably fix a unarc file error if a user can select a restore point that will roll Windows back to a date when they could run the required software without any unarc.dll error message popping up. Follow the guidelines below to restore Windows 10 to an earlier date.

  • First, open Run by pressing the Windows key + X hotkey and clicking Run.
  • Enter ‘rstrui’ in the Open text box, and press the OK button.

  • Click Next on the System Restore window that opens.
  • Select the Show more restore points setting to fully expand the list of system restore points.

  • Then select a restore point that might fix the unarc.dll error.
  • Note that programs installed after a selected restore point will be removed. Press the Scan for affected programs button to see what software is deleted for a restore point.

  • Click Next and Finish to roll Windows 10 back to the selected restore point.

5. Check Out DLL Fixer Software

There are various Dynamic Link Library fixer softwares for Windows 10 designed more specifically for resolving missing DLL error messages. These utilities typically scan for and restore corrupted and missing DLLs and enable users to download DLL files. DLL Suite and DLL Care are two of the more notable Dynamic Link Library fixer utilities. However, users can also try unregistered versions of those softwares.

6. Reset Windows 10

As a last resort, users can reset Windows 10. That will effectively reinstall the platform, which will probably restore the unarc file to its original version. Note, however, that users need to reinstall most third-party software that was previous installed after resetting Windows 10. Users can reset Windows 10 as follows.

  • Enter ‘reset this PC’ in Cortana’s search box.
  • Select Reset this PC to open the window shown directly below.

  • Press the Get started button.
  • Select the Keep my files option.

  • Press the Next and Reset buttons to confirm.

Those resolutions will probably fix most unarc.dll errors so that users can run or install the required software. Some of the above resolutions might also fix similar DLL error messages that reference other files.

FAQ: Learn more about unarc.dll errors

  • Where is Unarc dll?

Like most DLL files, you can find the Unarc file in the SysWOW64 folder in C:Windows if you have a 64-bit edition or in System32 folder for 32-bit edition.

  • What is Unarc.dll Error code 11?

This error shows when the dll.file currently located in your computers is damaged. You should replace the file with a proper version.

Editor’s Note: This post was originally published in June 2019 and has been since revamped and updated in April 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in January 2019 and was revamped and updated in January 2021 for freshness, accuracy, and comprehensiveness.
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  • unarc.dll is not a default windows system file. I have win10 and it’s no where on my machine even in the registry. Running DISM.exe and (noob!) CCcleaner is not at all necessary to replace a missing or corrupt file. Those step suggestions are a waste of time.