Happy Dude, I am in my sixties and not that good with software, so I was not quite sure, without bothering you more, exactly hope to carry out your directions, thank you so much for responding anyway.
However I could follow what Spiritsongs said and I tried Superantispy first, but it would not stay on the download site long enough to download!!
So I went for Malwarebytes first, and it found 31 Trojans, (now quarantined) and following a reboot, for the first time in several months, I did not get a "ding" on boot up, and a window saying there was a missing DLL file in windows, brilliant!!
I then downloaded superantispy, and that found 12 tracking cookies.and following another reboot, Vista updated for the first time in 6 months!!! (36MB of data!) I have my old laptop back!!
My main problem now is-
1) Do I resort to AVG again, I was never happy with it, and why would it never update, or indeed pick up the Trojans?
2) I am tempted to download Avast again, but why did it lock up my PC?
Thanks again for your help, Micky77, thanks also to you, but I am not quite sure I could carry out a reinstatement using the partition, the AVG was a genuine paid for version, but I had alsorts of problems, and there response time to problems was sometimes in excess of a week!
Thanks again
Silvo