Problem with PC freezing while playing EB

I've been playing the Romani in EB.74, and sometimes the computer freezes and makes a very load drilling-type noise from the monitor. This almost always happen when playing battles. Could it be a problem with the mod, or maybe just my PC not coping with the graphics or whatever?

Thanks for any help...:egypt:

Damnit wrong smilie

Any ideas anyone? If the computer crashing is part of playing the beta version of EB, I'm fine with that, I love the mod, I just want to be sure its not a problem with my PC that I could sort.