Thanks for your replies. You are correct on the demo version that was previously installed. However, since my first post - I installed the demo version again and now have the same problem that I have w/ the full version. Also, to be more specific - I indicated the game crashes - but actually my entire system crashes (blue screen of death).
Video card: ATI Radeon HD 4650
Driver: 8.563.0.0 12/10/08
I checked for a newer driver, but apparently I have the latest.
Any help, greatly appreciated.