Hi Everyone!

I have a big problem now that bugs me much! Those last days when i'm playing Civ3, my computer restarts itself every half an hour or so during gameplay and it really freaks me out...

I heard that it could because of overheating (now there are pretty hot days)... What do you suggest i should do?

does it do this for any other games, or just civ?

Overheating, probably. Your PSU might be bad, make sure you have adequate cooling (case fans etc.).

Yeah, I would install a more powerful fan&heat sink over the CPU right away.