6 Ways to Fix the Uxtheme.dll Not Found Error

Many of our readers have complained about getting the C:\Windows\system32\ uxtheme.dll is either not designed to run on Windows or contains an error (0xc000012f) error while launching apps on their computer. The Uxtheme.dll is a Dynamic Link Library file associated with the Microsoft UxTheme Library.

The error may appear due to corrupted system files, a damaged app, an outdated device driver, or an accidentally deleted DLL file. Restart your PC, check Windows for pending updates, ensure the DLL file is not in the Recycle Bin, and then run a full system scan using a reliable third-party antivirus tool.

How can I fix the Uxtheme.dll not found error?

1. Uninstall the affected app

1. Press Windows + R to open the Run window.
2. Type appwiz.cpl and click OK to open the Programs and Features window.
3. Look for the affected program, select it, and click the Uninstall option.
4. Click Yes or Uninstall again if prompted.
5. If the app is of no use, don’t reinstall it. However, if it is, reinstall its latest version from the official website.

2. Download a DLL fixer tool

DLL files are important for system apps and third-party apps to function properly. If the DLL file is missing or you encounter DLL-related errors, they could hamper your device’s functionality.

You can copy the DLL file from another computer, but if you are comfortable with that, we recommend using a third-party DLL fixer tool. All you need to do is download, install, and run it to fix all DLL-related issues.

3. Re-register the DLL file

1. Press the Windows key, type cmd in the search box, and select Run as administrator to launch the Command Prompt with admin rights.
2. Type the following command to re-register the Uxtheme.dll and press Enter:regsvr32 Uxtheme.dll
3. When prompted, click OK to confirm, then reboot your computer to save the changes.

Before following the steps, go to C:\WINDOWS\System32 and ensure Uxtheme.dll file is present, then reregister the DLL file.

4. Run SFC & DISM scans

1. Press the Windows key, type cmd in the search box, and click Run as administrator from the list of options to launch Command Prompt with administrator rights.
2. Copy & paste the following command to scan the Windows image files for corruption and repair it via Windows Update, and hit Enter: Dism /Online /Cleanup-Image /RestoreHealth
3. Let the scan be completed, then to repair the damaged or missing system files on your computer, type the following command and press Enter: sfc /scannow
4. Wait for the command to complete and reboot your PC to save the changes.

5. Restore your PC to the older version

1. Press Windows + R to open the Run console.
2. Type sysdm.cpl and click OK to open the System Configuration window.
3. Go to the System Protection window and click the System Restore button.
4. Select Choose a different restore point from the System Restore window and click Next.
5. From the list of options available, select the one created before you encountered uxtheme.dll not found or designed to run on Windows, then click Next to proceed.
6. Click Finish.

Windows will restart, and try to restore your system settings to the chosen version. If it fails and you see System Restore did not complete successfully message after the system restarts, it could be due to conflicting device drivers or missing system files; read this guide to learn more.

6. Download the DLL file manually

NOTE

If nothing works and you are uncomfortable installing a third-party DLL fixer, download the DLL file from a reliable third-party website like DLL-FILES, which has been verified and tested by WR experts.

1. Visit this DLL-FIles page for Uxtheme.dll and click the Download button next to the appropriate version for your computer.
2. Once the file is downloaded, double-click it and copy the DLL file.
3. Navigate to this path by replacing C with the system drive and paste the file:
   C:\WINDOWS\System32
C:\Windows\SysWOW64
4. Restart your computer to let the changes take effect.

In conclusion, to fix the Uxtheme.dll not found issue, you can restore the damaged system files via SFC & DISM scans, uninstall the app, re-register the DLL file, restore your system settings to the previous version, or use a DLL fixer tool.

Do you encounter DLL-related errors or pop-up messages more often than you think? Check out this guide to learn ways to prevent them. If you encounter DLL files missing on your Windows 7 computer, we have a detailed guide for you.

Before you go, check out the guide on what to do if you encounter the Tzres.dll Not Found error on your computer.

Did we miss a step that helped you fix the issue? If so, share it with our readers in the comments section below. We will add it to the list.