So, I logged on today and, I was presented with this: For some reason, all my Steam games were deleted, although not my non-steam games. Anyway on the bright side, 250 posts. Point
Really weird, usually it only removes games if you right-click a game and press Delete Local Content, anyways go here: If its the default location then here: C://Program Files(x86)/steam/steamapps/common/ and see if the games which are technically "deleted" still exist there. If they do, then just click "'install" on one of those games and its supposed to download the full game but it wont since it already exists. It will download a small file and you should be able to play it.
Nope. Thanks HQ, I only decided to re-dl TF2 seeing as I'm getting this on my birthday (4th Nov). Thanks.