Many thanks for the advice.
As per the messages above I have un-installed TuneUp Utilities 2012 and re-booted the computer.
I ran sfc \scannow with no violations reported.
I was unable to go go to a previous restore point. For quite a long time I have not been able to do restorepoint backups of my system. At present I just do traditional backups of important data to an external HDD.
However the original problem remains.
I have also added my system specs to my profile.