Preparing to launch failure

So i was going to log on MW3 today and then as usual it says preparing to launch call of duty modern warfare three multi-player but it has been there for a while, so i canceled the launch and launched another game, it worked fine it was weird so i logged in and out of steam and it had trouble signing in saying Something that has to do with my connection but a few minutes later i got to sign in. When i signed in the same error occured, now i'm not sure if this has happened to many people but to be on the safe side i'm going to re-install

Happens sometimes, i just kill the process and start steam normally. Works every time