I installed Avast and had to un-install several times as after a scan I lost internet access somehow. Firefox wouldn't start nor IE.
So I'd have to F8 during start-up and go to the "start with latest settings that worked".
So whatever Avast cleared up got undone I guess.
Ran two scans with
Malwarebytes.org un-installed Firefox and restarted, ran another "long" MBAM scan, restarted and reloaded Firefox.
Everything seems to work fine now but this was surely some tenacious little bugger as it's taken me 3 days. Steep learning curve here for a computer illiterate.
Thanks for all your help, great stuff...