I have the exact same problem. My machine keeps shutting down when i'm playing specific games, not all games. For example it shuts down when i'm playing HAWX, but not when i'm playing FIFA10. I searched the web for some answers, but without any real results.
I'm running win 7 x64, AMD Athlon 64 X2 dual core 5000+, 6gigs of RAM, ATI Radeon 2600XT. If anyone thinks they can help .. or need some other specs or error reports, just say. I am really puzzled about this event 41 crap. Please help.
LE : I think i found the problem for that event 41 thing. It seems that my video card was overheating. I mounted a cooler on it and now I'll have to see if it still shuts down. You'd better check the temps too, because mine was pretty serious, 90 degrees celcius on the GPU core, pretty insane i think. Hope this new info helps you too.