Alright, lemme make this short and sweet.

I got L4D2 just recently, and downloaded it with no problems. But, whenever I get to the end of the loading screen, the screen turns black, freezes, and sometimes crashes to the desktop without warning.

Please...somebody help me...

BTW, here's a video that shows how I feel about this:

http://www.youtube.com/watch?v=8TBQywGmMjQ

ლ(゚д゚ლ)