[Crpl. Lofton]

I recently played multiplayer Spearhead at school. Then I packed my stuff up and came home for Christmas break. I try to run Spearhead and now when I load the game and go to the map and click Normandy, I get through the video sometimes and then if I do get past the video I get to a screen with a nice painting of a german with an AA gun looking up. The red bar soon scrolls across the screen as the game loads. The red gets almost to the end of the bar and then stops. I am then sent back to the main menu. What do I do? MOHAA works fine....its just SH that is giving me problems...and I've played this game many times before on this machine....I'm lost....I don't understand. Please Help!