Gw freezing in GvG

Hey,

I've got a problem with my computer, because it freezes while I play GvG. HA, RA all other stuff are ok.

I have:

Athlon 64 2800+
XFX Geforce 7900GT
1Gb RAM
Epox motherboard (If you need any other info on motherboard I'll look up)



When we start GvG-ing the game works fine, but when the timer reaches 3min+ and we start fighting it freezes. Sometimes it freezes at 5min, sometimes 10min, 3min....

I tried closing all programs and I put the graphics on the second level of four levels in Gw, . It freezed....

Then the second try, I closed progs and put graphics on minimum. It didn't freeze. Should I blaim the vents on the card, because it is very very small :/



Thanks....