XP Pro (once you disable all the unnecessary service that go with it - about 60% of them by my rough count) has ran pretty well for me. XP Home is IMO useless and worthless... Win2k w/ SP1 is nice, but limited. SP2 introduces some instabilities, and SP3 and 4 are downright unstable (constant WFP errors, registry hack won't remove 'em, registry itself becomes corrupt and useless six months after install, etc.) It depends on what you use your computer for, as well as what your computer is. I have a homebuilt Intel-based PC it runs on... Intel-brand mobo, Intel P4 2.5GHz chip, DDR 2700 RAM... seems to work well w/ XP more than it ever did w/ Win2k. (OTOH, I haven't had to reload the Linux half of the box at all, except to rebuild grub after a Windows reload... which involved two reloads of Win2k and finally loading XP three months ago.) /P