Or get yourself a recent Macintosh. (New eMacs can be had cheaply; meanwhile, the cheapest iBooks are under $2,000 and worth it.) There aren't any worms for MacOS X, though in case someone writes one, make a non-administrator account and use that for downloading porn/flash games/stupid shit, and another account for banking.
If you don't have $2k to spare, get Linux and install that on your PC. Though it requires more knowledge and maintenance than OSX.
Fuck, I think I might have gotten that a couple of days ago. It had an e-card of some woman's backside which I could wiggle and twist around. I've re-installed media player, run spybot and I'll have to get my brother in to do some disinfecting, until then no online banking I guess.