The utility on your link work like a charm,
I had searched around and downloaded a different version that did not seem very happy with Win 8.1
(Wss.troubleshoot_2.0.0.1) but your one has done the trick.
Run this, and then added the new shares correctly at the appropriate levels.
Much better than trying the windows way..i'd started to have a go at that, and given up.
Folders are now happily appearing on the media centre downstairs again, and I have all my music back.
Thanks again.
John
PS, note to self, don't get greedy when there's spare slots in the server, and try and re-use old drives again. It doesnt work - Drivepool rejected it before for a reason - and wiping off the dust and putting it back in a different place does not make things better, the drive was duff - so throw it away.