Hi David,
Sorry if my references to both my XP and Windows 7 desktop systems added confusion but for me, comparing the two showed that Avast was not behaving correctly on the Windows 7 system.
The issue still remains with the Windows 7 system i.e. automatic streamed updates work but to get the latest virus definitions file, I have to download it from
http://www.avast.com/en-gb/download-update. Trying to update from the program's user interface does not work as it just sticks on 'Initializing, please wait ...' and no progress registers on the progress bar even after an hour.
With the less important failure of the Rescue CD creation facility and having reported this and the automatic update and manual update from the program's UI issues to Avast Support, it is disappointing that although they issued a ticket, there has been no further contact from them.
Regards, Kes.