Greetings and thanks in advance for your help.
The problem with my computer is identified by me as follows;
In Control Panel the icons for hhe following have a small image (like the Windows Update shield) superimposed on them at the bottom right hand side.
I seem to have got rid of this little image which was on the icons for a number of programmes, More or less all of the infected programs were utility programs including,
Driver Genius Professional
Advanced System Care
And All Anti Virus Programmes
All other Virus checks have indicated that the system is clean. This is not true. It has a very malicious Virus which has reappeared even after a full format of the hard disk.