Hi,
Regarding the locked files reported in the AVG scan, I repeated the scan making sure AVG was started as administrator, the results were the same. I went to:-
http://www.bleepingcomputer.com/tuto...torial143.html
regarding the locked System Volume files but couldn't find relevant info. Is there something simple I'm not seeing? Not being that familiar with Vista I've no idea why the various files should be locked to AVG or how to unlock them.
Assuming that as far as you can tell this computer is free of any infection, I will follow up all the other links you have provided.
Many thanks for all your help.
Regards