Can't Restore CSC Backup

Hello.

Yesterday I used Comodo System Cleaner version 3 to clean my registry, privacy, and disc. After starting my computer this morning, the fonts in all my Windows applications are slightly different (and more difficult to read) and my Firefox browser won’t load properly (it stalls with a black screen before any menus are loaded). I haven’t explored what else might not be working yet - this is bad enough.

CSC is set to create backups before cleaning, but restoring these files from within CSC doesn’t seem to do anything. Am I missing something?

What should I do to restore my system? All suggestions gratefully received…

Please follow the steps Victor posted here: Corrupted Windows Font

Many thanks, that appears to have done the trick!