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.
