To summarise :-
1. installing Nokia PC Suite failed to fix the problem;
2. USB drivers are still working O.K.
My experience includes applications that can work when first installed, but after they are "broken" they will not work upon a second installation. Something is left behind which makes the installer think the application is already installed, and you have to un-install before you can have a further successful installation.
With luck one simply downloads and re-installs - it might not be fully functional, but with luck it will deposit enough valid information for Add/Remove Program to un-install cleanly.
If that fails I have seen strong recommendations for http://www.revouninstaller.com/
Any ideas how I can roll back or fix the problem??
Alternative possibilities :-
Any registry cleaning can be undone by restoring the registry,
preferably via the backup which CC will have recommended that you do, alternatively via :-
an ERUNT backup (creation takes 10 Seconds and is automatic at start of day); or
System Restore to a point pre-dating the cleanse.
Any file cleanse cannot be undone.
Unfortunately CC refuse to delete into the ReCycle Bin,
and once it is gone it is gone for ever, but you have 3 possibilities :-
1. RECUVA can with luck retrieve files that have been deleted, and the quicker you try it the luckier you will be;
(The longer you wait the greater the risk that the deleted file will get over-written, and if RECUVA is not already installed then Murphy's law dictates that installing RECUVA itself will over-write the file you wanted to un-delete !!!)
2. System Restore to a point pre-dating the cleanse - you may be lucky;
3. System Restore to the point at or immediately after first installing Nokia PC Suite.
Regards
Alan