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Thank you all for your help - particularly Chris and Naz.
I uninstalled Norton and managed to get AVG to install properly. (I couldn't uninstall AVG until it had been installed properly - however, I use AVAST on my other lappy so I am going to uninstall AVG and put AVAST on).
Malwarebytes found 21 (yes twenty one) infections. AVG found 2 viruses and 4 corrupted files which it has now dealt with. I have then used disc cleanup and defrag. When i get a bit more time, I will sort it out properly because he has no end of crap on there that is totally unnecessary and slowing the whole thing down.
Lord knows what websites he has been on - my on lappy had no infections and nothing to worry about. His was a disaster area though.
Thanks though. Bm x
(And yes Naz, had i struggled, there would have been an email winging its way to you!!!! lol)