I had thanks B-rock but have given it another try but it hasnt resolved problem. After restore it sync'ed quickly again and got slower up to 890 tunes when it stopped - error 50 again, then error 13010 cannot sync and the song ot stopped on could not be read or written. Tried Itunes diagostic and it advised no Ipod connected although it was.
If it hadnt cost so much it would have left by a window now!!!! Last resort may be to remove itunes and reinstall although my library is not backed up anywhere so I understand there is a small risk I lose that. But if you have any other suggestions I am all eyes! Once again thanks for taking the time and trouble to help.
D