You can make a link to:
C:\Program Files.…\Avast4\AshQuick.exe “path”
There are some limitations on it - only the Professional version allows scheduling - but it can make what you want.
Anyway, I suggest you run a scan sending it to ‘background’. Start avast antivirus and run the scan, right click the skin and you will see this option. Background scanning cannot be scheduled but you will take less resources of your machine to scan 8)