Ja, I downgraded to Windows 2000 just so that I can use IE5 again. Its fast and doesn't have the bloat the modern ones have.
Just an aside though, has anyone also found that not all sites work with IE5 and IE6? Its probably just bad web develolpers. I've also found some of my email accounts like gmail and hotmail locked for no reason, but I just create new ones. I also don't know why I've had quite a few fraudulent credit card transactions coming through.
Anyway, i still love IE, especially IE5 and IE6, but I'm sticking to IE5 because its lightweight and it "sucks" the least.