I am still working on this and finding a distinct lack of success so far. Yes, firewall enabled and only the basics allowed in. There is one 8MB partition which I don't know why it is there but as it was small did not bother with deleting. maybe a mistake.
Some of the advice I have come across seem draconian, I have lost the copy I made of the web page. It involved three different stages, using three different anti virus programs and a big list of files to delete one including Powerpoint.exe
Yes, this one is real pain and I only have three days to fix it.
Anti virus programs updated daily. Thanks for the advice so far. One web page said 'buy a new computer' and that would be nice I must admit.