Error when updating steam, Ep1 trubble?

[Ravioli]

Whenever i start steam it tryes to update platforms, and it reaches 100% but then it gives me an error:

http://img147.imageshack.us/img147/9913/error8vp.jpg

whats wrong? I want to fix this as soon as possible so i can play Episode 1 when it comes out!!!

 

[giant384]

reinstall steam