Buy Vista for its exorbitant price, then spend a fortune upgrading your computer so it will run at all. Alternatively save money by moving to Linux, which works even on old machines. I am sticking with XP Pro for situations where I HAVE to use a Micro$oft OS to use certain commercial software, and Ubuntu everywhere else, including the 64 bit version on an AMD 64 3200+.
The Opera and Firefox browsers work on both and the free "Open Office" office suite does too.
