Wouldn't the Drive Mapper in PM8 have helped here?

I'm not sure, but I tend to doubt it. What I hadn't realised until Sephiroth cued me to it, was that every single occurrence in the HKLM hive pointed to the wrong drive! Literally thousands of entries, every single class entry, etc, etc - all screwed! Imho it would take some piece of software to sort that lot out.
The extent of the problem was being masked by both partitions being on the same machine - it looked as though things were relatively OK because applications, services, et al, were actually accessing another partition, the original G:, instead of their parent partition, H:.
I've reinstalled the lot, many happy hours :( , and now everything is smooth and silky. :D

There used to be a nice program around,
called "COA32" ( Change Of Adress ) that did this a real ease in Win9x.
I have used it in W2k as well.
It looks for reg.keys and shortcuts, and you can tell it to
replace "X:/some.place/" to "Y:/some other_place"

Thanks Bearcat, I'll have a hunt for this - just in case! If I find it I'll post it. :rolleyes:

Found it. There's an updated version, COA2, described at http://www.pcmag.com/article2/0,4149,21277,00.asp
You can't get it from PC Mag without a subscription :( but it is also available at http://www.wlcweb.com/newsletter/software/coa2.zip :)