I've been trying to clone the HD on one PC and put that into another to save reloading in everything since both machines are similar. I've used a free utility called HDcopy which reckons it can do this.
On installing the clone in the other PC it starts to load XP then locks up. I've tried repair using the XP installation CD, but that demands an administrative password. Which I've never actually bothered with, so I assume is the default one. I do have my administrator one - but that's not the same thing.
I have all the original installation CDs for the progs I use - was just trying to save some time.