~S~
Friend of mine had a similar problem on Vista , so we went through clearing every single file from hard drive, reinstalling visual basic and . Net , then verification of files through steam library - what we find out is that every verification brought diffrient results. Anyway he can play now single player but he can't connect to some servers simply getting launcher.exe crash. Have no clue what may cause this problems. However I would recomend anyone having issues with launcher.exe problems one thing: try to reinstall steam it self or move it from system partition if it's installed there, maybe that will help ... good luck
__________________
Asus P6T V2 Deluxe, I7 930, 3x2 GB RAM XMS3 Corsair1333 Mhz, Nvidia Leadtek GTX 470, Acer 1260p screen projector, Track IR 4 OS ver5, Saitek Pro Flight Rudder, Saitek X52, Win 7 x64 ultimate