I have 1.5ghz AMD; 2GB ram and currently an FX5500 graphics card (soon to update to 6600) My problems are that the screen will go black and while I can hear the music and sounds, it's not coming back. I also get "inverse" graphics occasionally, like a photo negative on the backgrounds and have to save and restart. I am glad that you other guys are having these problems, not just me and my pc. I suspect it's huge maps (which I play with Marathon) so I might just play on large or standard in future. But I hope the graphics card will help.