Reboots at the next turn, save file

[linglong]

The game worked fine for me for hours in one game but after the first I started a new game and it began rebooting my computer. Here is a save one turn before it crashes, and right after the third city popup in that turn.
http://savefile.com/projects.php?pid=619892
I wonder if you guys get the same or some other error at the same point. I tried to unpack Art0.FPK but dint help.. Might try 4.12 ATI now though..
Computer:
AMD xp 2500
512 ram
ATI 9600
Nforce2 sound thing I think and some other nforce2 stuff..

[TenderBranson]

I had that problem once too. Try flushing the cache, also double check that anti-aliasing is disabled in the Civ4 graphics options.