Ledpig, you never could fly, so what's the problem again?
Le' Pig, I hope you get your computer running again shortly.
Try to find the CD that your graphics card came with. Then try uninstalling your video drivers first by going into the add/remove programs option in the control panel from safe mode. Reinstall the driver from the CD and if that doesn't work, run a memory test. Look in Hornet's post for more info.