[SOLVED]Call of duty modern warfare 2 multiplayer help

Hey guys, I have a problem with CoDMW2 Multiplayer (legit). When I launch the game from steam the screen goes black and I just see the windows loading thing(blue circle) spinning around in the middle and the only way to close this is to use Task manager. There is no error code. HELP!?
Btw I’m using Windows 7 Ultimate 64bit.
Answer #1
Try uninstalling and then re-installing the game?
Answer #2
Did it, works now. Had to reinstall steam though.. took ages and i had to reinstall every game i had.