Singleplayer is fine, Multiplayer CTD

[Conrex]

As the title already says a friend of me can play the singleplayer for hours, but when he tries to join a multiplayer game the game crashes to desktop. We tried alot of servers and it isn't working, he just can't play on any server.

We tried loads of things
- dx10 off/on
- gave him my config
- reinstalled the game
- updated drivers
- reinstall direct x and all this other stuff

He doesn't have AVG so that can't be the problem...


Intel Core i5-2550K 3.40GHz
8.00 GB RAM
gtx 680 Twin Frozr 2048MB
Windows 7 32bit