1. Scan your computer for viruses. Virus activity can affect DLL (Dynamic Link Library) files that control how the video card functions.
2. Download the most up-to-date drivers for your video card. Drivers are dependent on your video card manufacturer, either ATI or Nvidia.

3. Click 'Start' then type 'Memory' in the search bar. The Windows Memory Diagnostic tool should be the only option. Click on it and select the 'Restart Now and Check for Problems' option. If serious errors continue, you'll have to replace the random access memory (RAM) in your computer.