OMG! I maintained an old computer on xp, even though it was an Athlon 64 x2. That's because there is so much crap that only runs on windows. Despite my best efforts with anti-virus stuff, it finally got so hosed with corruption, that I terminated its life. I put Linux on it, since I couldn't see myself paying for win7.
Now I can't borrow books from the library anymore, since I can't get Adobe digital editions running on the xp emulator (Wine). It's sad.