Today there was a power outage while my notebook (with battery removed...) was in sleep mode and when I booted windows it was set to classic theme. When I opened the "Personalize" window it was blank (see here
) and nothing happened when clicking on the links at the bottom.
I noticed that the "Themes" service had failed to load (Error 126: The specified module could not be found.
) so I ran "sfc /scannow" and also found a registry fix which I applied.
The theme is now back to normal/aero but the "Personalize" window still looks the same but all 4 links (except screensaver) at the bottom work now but I can't select any other themes since they're not visible. Also I can't enter the "Advanced appearance settings..." option.