Isn't problems exactly that that the threadstarter has?

But yes Ross, you're correct in this. For compatible multi-booting, all OSes should live on their own partitions. What I understand though is that he doesn't want to be multi-booting. Yet as Tomas said, it all depends on where he installed his XP to, if it's now in the same folder as Windows 2000 was, it's going to be difficult.