Its a long time bug and probably one not GpG fault but rather ATI fault.
IF you have a 4870X2 and you play in windows mode with AERO enabled, the game MAY(its pretty random but not so rare) eventually stall (not responding) and the computer will completly freeze after a while.
The workaround is to disabled windows aero and the problem will never happen.
Could someone at stardock or gpg contact AMD/ATI and discussed about this?
This problem is known to happen in World of warcraft too.
There are some thread about this on game.amd forum but Its been a couple of month and no fix yet.
im in vista 64. dont know if vista 32 is affectected too.
Only the 4870X2 seem affected.