thanks for your replies; I'm running a GeForce 8500 GT, Driver version 185.5.
I've had no probs with other games freezing up. I first hit this problem on
3rd tutorial, and again on 4th. Re-run 3rd tutorial and yes it happened again. I think I was moving the russian sniper towards a position where he could snipe the enemy around the farmhouse 1st time, 2nd time I put 2 men inside the 222 armoured car to capture it, they got inside then the program just froze, although I could still move the mouse - nothing appeared active.
My pc; AMD 64X2 Dual Core Processor 5200+, 2.71 GHz. 3.00 GB of RAM.
Windows XP Home, Service pack 3.