Currently Being ModeratedMay 6, 2013 2:15 PM (in response to falcon eye)
Hello, are you running Windows, or OSX??? I doubt there are Regitry keys in OSX, but don't have any MS Apps.
If OSX 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.