I'm clicking on the "move to chest" button..how's that operator error? it's not being moved to the chest
I ment to say that expect them to be moved, but as I pointed out Avast can only do that if they are not in use. Since you expected them to move and did not realize this (not knew this) I called it a user error. (I should have put that between " "s)
I saw it scan 450000 files
Don't be surprised if you do have them. Avast also counts files within archives. I cheched here and about 12.000 files per 1Gb used harddisk space is about normal. So if you have about 37gb used (give or take a few) 450.000 sounds normal. The amount of files scanned also depends on the settings you have when doing the scan. (thoroughly, archive scanning)

I suggest you run a full system scan while in safe mode and wait for Avast to finish.