Have NVIDIA GeForce 8400M GS on Dell Inspiron 1520; 1.5 Ghz Intel Core Duo

I have played the game around 20 times in window mode, and 10 times in full screen.

When I run in window mood, about half the time after some point (sometimes 20 turns, sometimes 100) the game flickers and locks and shows a message "Display driver nvlddmkm stopped responding and has been succesfully recovered".  Most of the time the game unlocks after around 10 seconds and continues to work, but sometimes it doesn't and I have to close and restart.

I have never had this issue or message when running in full screen.