I’d back up any of the personal files, if you plan to re-image it, the rest doesn’t matter. Usually My Documents, My Pictures, My videos, and any other file that you’ve ever downloaded into, maybe files on the desktop. If you buy a Windows disc, that would be used to Re-image it back to having nothing except for the OS. Using a restore function may solve the problem but may not fully fix the issue. I’d recommend a Re-image and start from fresh, just be sure and back up all the personal files, and download any necessary drivers for Video, Lan, etc from the manufacturers site.