Does anyone else have this problem? I've signed up for an account on the Steam forums, but appending approval there before I can create a topic, and the experts here have been very helpful before so I figured I would give it a shot.
I'm running Windows 7 64bit on an Asus G51VX. All my other programs/games seem to work fine. This only started happening yesterday, and previously I've had no problems with Steam or Modern Warfare 2, which is the only Steam game that I play.