Posted 06 June 2010 - 12:37 PM
Have you tried uninstalling your video drivers...and then reinstalling them?
System manufacturer and model?
If not, Step 1 would be to pull out your drivers CD...or download the drivers from the appropriate website. If system is "name brand", then drivers for that system should be available at the web site of the system manufacturer (Dell, HP, eMachines, etc.).
To uninstall a device
1.Open Device Manager (Start/Run...type devmgmt.msc and hit Enter).
2.Double-click the type of device (Display Adapters) that you want to uninstall.
3.Right-click the specific device you want, and then click Uninstall. You can also double-click the device, and then on the Driver tab, click Uninstall.
4.In the Confirm Device Removal page, select Delete the driver software for this device if you also want to remove the device driver package from the driver store.
The Delete the driver software for this device option removes the package from the driver store. It does not remove the currently installed driver for any other operational devices that use the same driver. If you remove the driver from the store, and the device is connected to the computer again, Windows must search for a copy of the driver package in the standard search locations, including possibly prompting the user for media.
To reinstall, you often just have to double-click on the driver package and drivers will normally self-install.