Try this.
To get to Device Manager click Start>>Run type devmgmt.msc click OK Look down the list for Display Adapters
Click on the + sign to expand
Double click on your video card
Click on the Driver tab
Uninstall the driver
Restart the PC
To get to Device Manager click Start>>Run type devmgmt.msc click OK Look down the list for Display Adapters
Click on the + sign to expand
Double click on your video card
Click on the Driver tab
Uninstall the driver
Restart the PC