7

Based on your system information, I would say that 9 hours and still running is well over the top and something is wrong, I can only assume some other interaction (possibly as has been mentioned by (tednelly). What other security software do you have installed ?

I’m also remain to be convinced as to the need of a thorough scan with archives, other than for a first time to give a clean bill of health.

Archive (zip, etc.) files are by their nature are inert, you need to extract the files and then you have to run them to be a threat. Long before that happens avast’s Standard Shield should have scanned them and before an executable is run that is scanned. Thorough is also by its design very thorough and perhaps a little overkill for routine use, were a Standard scan without archives should be adequate.

I have only ever done a through scan with archives once shortly after installation just to ensure a clean start state, but with XP for example avast will do a boot-time scan after installation if you select it, this I believe will be quicker and reasonably effective. Like everything in life things are a compromise.