Yeah, XP is just Nt 5.1.
Windows 2000 is just Nt 5.0.
There really isn't all that much difference between them unless you have your MSCE, then there's *all* kinds of difference between them.
Whatever.
Anyways, XP is a little better for gaming. I got such good resultz under Win2k, that it wasn't all that much better than XP for gaming. I would say that I have gotten several games that wouldn't work under Win2k to work under XP (without ACT installed).