Left 4 Dead won't load

[The Red Cape Diver]

Every time I attempt to launch Left 4 Dead, steam gives me the preparing to launch message, but then the window closes before it goes any further and doesn't launch. The program doesnt appear in processes, so I know it isn't running at all. I have attempted to reinstall it a few times and it hasn't been fixed, and all my other steam games work fine, it's just Left 4 Dead that is crashing before it loads. Any one else experiencing this problem?

[Zombie Hunter]

its just a glitch that happened in the recent update, just restart steam and it should be fine

[Graf Irrationale Zahl]

Luckily not. Next time you try to run L4D check out the "event viewer" (can be found under "administrative tools") and look for an error message under the category "application". Maybe there is an explanation.