Hi Paul,
Were you trying to use the Win-7 BackUp and Restore Image for the first time? Second time it should be fine.
However, any question, run chkdsk /r to make sure all the used and unused sectors are OK. Other choice is to download TD Tune (free version) and check both the Health Status tab and run the Error Scan to see if there is any problem with it.
Agree with r3x, the 'error message' is very helpful determining if there is a problem.