I "eventually" after much sweat got iMac to recognise my iPhone and iPad.
I then in desperation used "CopyTrans Drivers Installer" to fix my PC and get it working.
This whole process must have taken at least EIGHT houhrs, over two evenings of sweating it out!
You may ask why worry about the PC. I had problems trying to do a restore once before and was advised by a Apple technician to try a PC and then was able to fix my problem, so I now run double backups!! I am now always very careful!!
This "recognising" seems that this is a common problem having asked around. WHY?