What model Dell, please?
<<...and after getting the Dell Recoverey disk I tried to repair the files using recovery console. This did not work.>>
What did you try...what error messages did you receive?
<<But I now have a "My Name.ComputerNo" folder...>>
Can you post a screenshot reflecting this folder...using Explorer view?
<<So following other advice I restored to a previous point, again using recovery console.>>
Do you have a link, reflecting the advice you followed? It helps to know exactly what you intended to do...and what you actually did.
FWIW: Relevant MS Guidance, Recovering From Corrupted Registry