It can be done, I've done it before, so as Rufo said: If you've installed XP first on one partition, and then want to install 2000 or 98 on another partition, you should run the XP Boot data Repair from the CD so it fixes the boot loader data. But when I did that, I think I had XP as a FAT32 filesystem. It's important that win98's boot data is on the first primary partition so that it can boot. If your first partition is in NTFS, then you're gonna have a couple of problems, since 98 can't read its boot data off NTFS