Thanks Pdub. It worked. Steam and AVG both open right now after the fix.
Good thing I don't have to do what el badman suggested.
I didn't need to delete the other .blob file. Seems like AVG messed around with Steam loading before Steam got updated and shite happened.
I just noticed this post in this thread:
ixcuincle wrote:I joined...I'll try to play as much CSS as I can but I like Zombie Mod for CSS now...it's a better style of CSS which lets you make barricades out of map objects to keep zombies away. Fun!
lol, Left 4 Dead.