I was using FS2002 without any problems after Christmas, then my motherboard/video card fried and I replaced both and a new NVIDIA RIVA TNT 2 M64 32 Mg AGP video card and new drivers for the SB PC 164 card. I have a P3 800 with 256 Mg RAM on Win 98. Since the replacement, I have not been able to complete a flight without the program hanging (I can hear the engines but usually after an ATC instruction, the program freezes, interestingly the mouse pointer still moves, but nothing operates and I need to reset the PC to shutdown.) This occurs anywhere from 10 minutes to 1 hour into flying. I have the newest drivers for the NVIDIA.