Mike
Many thanks for your pointer.
All seems to go well when I run the program in safe-mode. I got 229 critical errors on the 1st run and then nil on the 2nd attemtp.
Then I ran Ad-Aware under my own full signin and got 68 criticals, did a quarantine and then had the delete process 'hang'. Tried again and still had 68 errors.
Any more thoughts? By the way I run AVG free - which is auto-updated - and also Spybot.
Scottie Dog