I get the exact same crash, I was worried I was the only one.

Multiplayer: As soon as I double click to join a server it goes black, then
crash to desktop. I was getting BSODs but downloading a new sound card
driver fixed it somehow.
Singleplayer: Loads map but as soon as its done loading i get same as above.

This has never happened before and just started today after I installed SP1!

MICROSOFT HELP!!!