if its an nvidia gpu, the display driver is probably not compatible with your os...even if u have a disc with a driver for win 7/mac/linux, its not made specifically for win 7/mac/linux i still get blue screens for random reasons with a gt 240, but by cleaning my registry and defrag my drives it surprisingly stays up a bit longer and i can have a decent comp session on it. My permanent solution would be to buy a different gpu