Validating team fortress files Free naughty chat sex rooms
I had the same problem but I only knew of this solution myself, not from someone else but I did know that this is the most common way of getting rid of problems with Steam or the game in particular.
So, when I want to play TF2, it comes up with a window saying that "Steam if validating files".
I've already tried cancelling and re-validating before, to no avail.
its some bizarre combination of validating and defragging and allowing each box to sit there for a certain amount of time before trying to relaunch the game. Uninstall TF2, then re-install so that it can get fresh files....and/or uninstall steam to completely wipe the old files, and start from scratch.