Good morning, Thank you all so much for your helpful suggestions.
In accordance to Murphy's Law, the day after I posted this someone from the helpdesk came to install something and we got the famous 'blue screen' which MS loves to exhibit from time to time.
When I left work Friday night, I had just been delivered a new, all singing all dancing locked down PC and on Monday morning I shall start trying to get my working environment back on line.
Once that has been done, I shall follow your suggestions. I'm sure that with all the pointers you have given me, I should be able to get further down the line than previously.
Sorry for now replying sooner,
Anne