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Windows 7: Cannot Uninstall UxTheme Core Beta under Windows 8 after upgrade

03 Aug 2013   #1

Windows 8 Pro x64
Cannot Uninstall UxTheme Core Beta under Windows 8 after upgrade

I upgraded in-place from Windows 7 Professional SP1 x64 to Windows 8 Pro x64. I do not have Windows 8.1.

I forgot about UxTheme Core until post-upgrade, then figured I might as well uninstall it since it was designed for an OS I was no longer running.

However, I am not permitted to uninstall because "Your theme subsystem (e.g. uxtheme.dll, themeui.dll) has been tampered with. UxStyle requires these files be restored before you can continue."

Well yeah, these are Windows 8 files which have not been touched--but they're not Windows 7's, so the uninstaller refuses to move forward.

I have tried installing the Windows 8 compatible beta on top of this one but that also fails based on a "previous version" being installed already.

Is there some way to forcibly remove the old Windows 7 UxTheme?

My System SpecsSystem Spec
03 Aug 2013   #2

Microsoft Community Contributor Award Recipient

Win 7 Pro x64 / Win 10 Pro

Welcome to the Seven Forums

Do Option 2 of this tutorial SFC /SCANNOW Command - System File Checker it will not harm any data or programs you have installed it will try to find and repair any corrupt system files that you have. You may need to do this up to 3 times with a reboot after each scan.

Then try to uninstall it.

If that does not work:
Click on the Start Button type in Services In the search box and then click on Services
Cannot Uninstall UxTheme Core Beta under Windows 8 after upgrade-1.png

Scroll down until you see Unsigned themes select it in click on the Stop text and let it stop then go to C:\Windows and delete UnsignedThemesSvc.exe
Cannot Uninstall UxTheme Core Beta under Windows 8 after upgrade-4.pngCannot Uninstall UxTheme Core Beta under Windows 8 after upgrade-stop.png


My System SpecsSystem Spec

 Cannot Uninstall UxTheme Core Beta under Windows 8 after upgrade

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