Major glitch/problem

[buffalo]

It seems that if I press the button to open up my briefing while in mission to check my objectives, my entire computer restarts. Does anyone have a clue as to what can be causing this problem.

It sucks because I get so into the story and the game, and then I have to go back and do things over again because the computer restarted. I was on the last objective in

*spoilers*

the mission where you have to infiltrate the American laboratory, I was standing in the same room as the professor when I went to check my objectives and the computer restarted. Any help would be greatly appreciated. Great game, it is truly a James Bond feeling I get while playing this.