Try to use: “SFC /SCANNOW Command - System File Checker”
Some time ago I do not have good experience using this method, special with: Aero, Window Color, Sounds.
With sounds you help me in “How to Change the Windows 7 Start up Sound”
Before I start my work I was looking for your:
Be aware that if you have modified your system files as in theming explorer/system files, running sfc /scannow will revert the system files such as explorer.exe back to it's default state. Make the appropriate backups of your system files that you have modified for theming if you wish to save them before running sfc /scannow".
How to make backup on my system, to be sure that “Aero” and “Window Color” come back after sfc /scannow ? Can I use “Restore Point”, or “System Restore”? Or make backup “C:” in additional hard disk?
When I finish my sfc /snannow work, how I can back to my modification before work?
Wish you all the best. With my best regards