Windows Themes no longer working...

Hello folks,

I hope someone here can help me out:

• My Windows Themes suddenly stopped working. I can select all other categories under "Personalize", but clicking on "Themes" results in the application crashing (i.e., the window closing) and a SystemSettings.exe dump file being created.

Upon booting into Safe Mode, I got a direct error message that I screenshot:

How can I easily fix this without resorting to unwanted measures such as a system restore or having to create a brandnew user profile?

Thanks in advance. <3