Thanks Wolfie...it sounds like he's pretty much FUBARed it up.
So is this what I do (keeping in mind that I can't boot from the c: drive apparently where all my data is):
1. boot up the drive I want to use as primary (the 80GB one since it's the only one which will boot up apparently) and reformat it - sounds easy in PRINCIPLE...
2. do a clean install of Windows XP on it (how will I do this if I can't boot up??)
3. copy my data across from the 20GB to the 80GB one (do I need to do anything with registry changes, etc - also all my shortcuts will be wrong - will my Start menu work at all???)
4. when all the data is copied, do the same format for the 20GB one and blank it out
I really, REALLY wish that I'd done this myself... [img]graemlins/crying.gif[/img]