|Thanks, Derek, that's not the one.|
The one I am after explains about checking the users section and apps, the virus had redirected them.
When you tried to get onto the web it was as though the the log on routine was lost.
The Microsoft KB showed how to drill right down to the specific %users% key, it gave a list of the correct settings.
I found the keys in the registry were wrong, I changed the first one on the list and they all corrected themselves.
Restarted PC, all OK.
Someone else has contacted me. He has this same fault after cleaning out Security Tool virus.
I wish I knew where I saw the KB article.