PO, did all that but it wouldn't untill.....
Spanners, knew I could count on you. It is a Seagate and I had their DiskW and did a proper install. Then copied C: to D: - all seemed well but it wouldn't boot. In the early hours had a brainwave, almost counted the files that went over, but did discover 9 that were left behind. Put them over and Bingo D: changed to C: and v-v now all is well except I now need to copy the old D: drive on to a larger cap D: drive. I have a seperate I/O controller with another IDE slot so I guess I can use that - what do you think. Now that everything is working OK I am about to format old C: first.
Thanks to both of you for coming to the rescue.