You people on Windows and your "anti-virus". (teehee)
Though I'd put the blame on your stupidity however. Valve is God, but don't expect them to risk their own money for your stupidity, obsessivly blind towards trading and whatnot. This is why I'd much rather play on TF2 than trade, while trading is fun and can lead to a *fairly mediocre* source of income, the risks as a centralized currency are too high. You lost what you lost and unless you can convince them to unban you (I wonder how Bottiger's handled that), you're probably gonna have to get over it and... rebuy your games? Ouch. Speaking of trading, did you happen to keep track of your items on a website? I recall seeing a site that actually does show and track EVERY TF2 item in existance.
Edit: Apparently you guys can't like, tell the difference between someone posting dumb shit and being an asshole. Hahaha.