Acrodog

The video in the introductory screens to united offensive seem to run ok, but the sound is choppy. Not really an issue - I don't care about these portions of the game. However, I got about 30 minutes into the game, into a situation where I'm doing rapid fire machine gun work, with lots of other movement on the screen, and the sound and video get so choppy that the game really doesn't work well at all at this point. Any advice would be helpful. Thanks