I do still have the problem.
I did a repair install and this caused further problems in that the system would not start properly-I carried out a system image recovery, which was successful, but of course the original problem is still present.
The next step is therefore a complete clean install and I am sure that this will fix the problem, but seems quite dramatic for following reason.
My OS is W7 Home Premium. My understanding that the original update dose not apply to a stand alone desktop system and is more allied to a client/server system. I can download other updates. I have therefore decided to live with this slight impairment to a file and see how things go. I have therefore caused a "hide" to this update.
I will keep the clean install in reserve until absolutely necessary.
Thanks