Thanks for that. I had in fact run CCleaner a day or so ago. I'll do it again...not too many passwords to do. Talking of which, I did a clean sweep, but still didn't have to put all of the passwords in. Perhaps a couple that seemed to remain. Don't know why.
I'm fairly sure that this problems appeared since my last sweep with Avast.
I'll give Avast another session, then perhaps Try Keef's suggestion and even give AVG another go now that people are not so cross with it.
This remodeling thing is going to curtail my den time. Will be here alone ripping out walls etc., when I could be doing something more sensible, like JBing
