Thanks Bob, much appreciated.
Sorry to disappoint but yep I've used the removal tool, cleaned all Alwil & Avast Files... removed Registry entries for same incl. Google Chrome opt in/out all to no avail.
Problem is as discovered, is the opt in/out screen is only visible for no more than a couple of seconds. Some people elsewhere tells you do a custom install..... do they really know what they are talking about I ask?
If you look at the custom install screen there ain't no option to opt in or out of Google Chrome - only Avast modules, they just don't comprehend! The only option is the 'flash screen' that appears very briefly as said, of course there's always the manual method of removal I suppose - I refuse to go down that Street because I shouldn't have to do.
Thanks, Dave