Cole,
What OS is this on? If it is win 3.x then the culprit is very likely the Win32s subsystem. If it is win95 or NT then the culprit is very likely a driver being used, the most common ones for causing GPFs are the video driver and the printer driver. A GPF is a memory conflict where some application has ciorrupt the meory of another. The application that reports the error is seldom the cause of the error. It is usually some other application that has corrupted the memory of the one that reports the error.
You can test the drivers by temproarily chenging to generic windows drivers and see if the error stops. The last driver you changed when the error stops is the culprit.