It really doesn't matter what partition you put each OS on. However, since Windows XP is still beta, you should probably put it on your 2nd partition, and w2k on the first one. I have my computer set up with 3 partitions- the 1st one has windows 2000 on it, the 2nd has windows xp on it, and the 3rd has all my data and program files. It works pretty well for me, but you should probably wait and see what some of the more senior members say before you take my advice. In any case, I had to install w2k first because my XP cd isnt bootable, so it needed to be installed from another OS.