The header says it
Not possible with avast and it wouldn’t make sense to do so.
If you tell us the problem (and provide details), we may be able to help you.
Avast doesn’t specifically scan the registry (e.g. only the registry) - during a scan if it makes a detection - then it should check for any associated registry entry.
I thought that when it completes a full scan (which takes a long time) then it invites you to scan the registry (which takes even longer). I must be mistaking what it invites me to do.
I’m merely trying clean out everything. I get harassed by a commercial product which tells me I have about 5000 errors and offers to clean them out for a fee.
I thought that when it completes a full scan (which takes a long time) then it invites you to scan the registry (which takes even longeri think you are mixing registry with Boot Scan .... avast may recomend that depending on what is detected in a scan
I get harassed by a commercial product which tells me I have about 5000 errors and offers to clean them out for a fee.We have free removal help here if needed.
Start a topic in viruses and worms forum section and follow instructions
Logs to assist in cleaning malware https://forum.avast.com/index.php?topic=53253.0
who said this in a reply? “We have free removal help here if needed.” That’s what I need: help!
Then follow the instruction outlined. 
We seem to have a misunderstanding here based on mis-interpretation of semantics. I thought it was fairly obvious that Pondus’ “here” meant the avast! support forums, not just this current topic. Particularly after he gave you a link to specific instructions for working on your problem. As David correctly (if a bit curtly) pointed out, you’ve been given assistance here (in both senses of that word) to direct you to the real experts, which is all we non-experts can do.
???
Not in this topic I didn’t !
Sorry, David, I only now checked back and it was Bob, my bad. :-[ I guess I was thrown off by the mega-levels of quotes, plus losing what little is left of my mind.