problems with loading maps

[sturmgewehr45]

Ok so basically everytime i log into pr, everything runs great up to the point where i go into a server. Everymap, except jabal al burj, crashes to the desktop when it loads to 100% I didnt have this problem before. I used to play a decent ammount, then kind of quit for about a month, then i started playing again a few days ago and thats when this problem started. I have vista and tried to find a solution but no luck. Any idea whats going on? O, and i tried reinstalling it, but that didnt work either.