First, make sure that you know what kind of video card you have. You may have to break open your box to see what it is. Then download the appropriate drivers for your card. Unzip them if necessary and place them in a folder where you can find them later (I usually create a folder called c:\Drivers\Video Card). Typically, you should right click MyComputer->Device Manager->Display Adapters and change your display adapter to standard VGA Adapter. This will force your card to use generic drivers. Reboot your computer and when it finds new hardware just point it to the folder where you unzipped your drivers. In the case of nvidia, you will download an .exe file. In this case, when you reboot, instead of going through the add new hardware wizard just cancel out everything that it asks you. Once you get to the desktop, navigate to your driver file and run it. This should cure your problem. Driver conflicts can be really tricky sometimes. You may be experiencing a conflict with another driver on your system. If you suspect this, download updated drivers for everything else in your system. If you have more problems, post again and try to be more specific. I hope that this helps.
