Computer Crash

Hi, I have the PC cd-rom regular version of Enigma Rising Tide and I have installed it sucessfully. However, when I play it for about 30 minutes or so my computer reboots. How can I fix this?

P.S. I have a NVIDIA GeForce2 MX with DVI-D and TV-out (IBM) Video card and I was wondering if it would work with the game? I also have installed the latest version of Direct-X.

it seems to reboot right after I shoot down a plane.

Start here: http://forum.tidesofwar.net/index.php?showtopic=1249 follow especially #5