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#11
Try sfc /scannow.
1] Open Command Prompt as an administrator.
2] Once Command Prompt is open, type the following command and then press Enter.
sfc /scannow
3] System File Checker will now verify the integrity of every protected operating system file on your computer.
4] Restart your computer.
If sfc /scannow did actually repair any files, your prob. may solve.
And If it doesn't work,
You may have to try to do a system restore to a point before the problem began occurring.
Then try :
1] Repair your system using installation dvd. Or if you have created system repaire disc then repair by using it by inserting it and rebooting pc.
If it doesn't work,
2] Then try to remember If you have created earlier system image using Action center>backup and restore>create system image. And if you have created system image before your problem then restore your pc by using your created system image.
else last and good option :
Clean Reinstall.