when i play flatout 2 single player its work fun but when i try to play online mode after 3 minutes when im in game my pc reboot itself any1 got any idea y

i have 6800 gt agp 8x
512mb ram
intel p 4 2.4ghz
psu 400watt

i also play fear online not even a single time fear rebooted my pc but this game flatout 2 always reboot my pc when i play online im upset

A handful of other people seem to be having one problem or the other with that game & it may or may not be related to the "starforce" feature embedded into the media itself.

You should contact the publisher for additional support, they may have an answer for you.