Gah I want to play the new Portal 2 update so bad but I've been without Steam for two months. Every time I try and install it (Steam), I get this error saying something along the lines of Steam.exe being deleted. It happens every time, and Steam is just mysteriously gone after that.
Edit:

I've Googled the problem, but every suggestion I've tried hasn't worked.
Edit 2:
GUESS WHO FIXED STEAM? I found a new solution and it worked yay. Just had to install steam, cancel the update, then update in safe mode with networking. WOOHOO!