This happens to everyone at some point of time or other and is most likely caused by some application
or third party utility overwriting your drivers files (or if you do not have had a right video driver to
begin with). To verify exactly what gets loaded, follow these steps. Open registry by going to STARTRUN
and entering regedit. Navigate to HKEY_LOCAL_MACHINE\hardware\DeviceMap\Video . In
this value of Device\Video0 points to a registry key that has the location of the video driver that
Windows is configured to load. for example:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ videodriver \Device0 . Navigate to
this key. Check value of "InstalledDisplayDrivers" . Its value indicates whether driver was loaded or
not. If the setting shows another registry location, a third-party driver may be getting loaded. Check out
Microsoft Knowledgebase article for more details:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q314854
