I am trying to play Sacrifice Campaign but on the first level, the game sometimes freezes, I can still hear the game running and I can perform actions with my mouse and keyboard and hear the response from my units but the image is frozen... This also happens when selecting units or in combat.

Edit: I noticed that the game freezes when I get a new objective also.

The same thing is happening to me, can hear stuff working but the screen is frozen.

I'm using...
Windows 7
NVIDIA GeForce GTX 580

I realise this thread is dead, but I just installed the game and had the same problem described above during the games tutorial.

If I have time over the weekend I will try the fix recommended by Thiev, and report back on how things go.

cheers!

This fixed it for me.