What operating system are you using?
If you're using Windows 8(.1), you can use the "Refresh your PC" function in order to reset your system but keep all of your files (It's in the metro PC settings).
If you're using Windows 7, try looking if you have any restore points, if you have updates enabled, sometimes they will be made when you update your computer (You can either search, or go to the control panel; Go to system and security -> press system -> system protection -> system restore).
[img]https://downloads.teeworlds.com/solidfiles.com/BqwMA86Gr8qaP/restore points 1.png[/img]
If none of that solves it, reinstall all of your drivers, run a sfc /scannow (in an elevated command prompt).
Don't throw away your current OS, it's annoying to lose all your files, and hopefully useless.
privet