on-Demand (“Normal” scan) you should enable archive scanning, but the ResidentShield (On-Access-Scanner/Background-Monitor) shouldn’t scan archives as

  • malware in archives is inactive until unpacked, and then the Shield will catch the extracted file

  • imho it would pretty much slow down your rather weak machine

  • setting the avast shield sensitivity to “high” would be a better approach to enhanced security…

  • and read the link “VirusRemoval” below in my sig about how to secure your system better…

you might want to browse the forums here a bit, especially the User’s FAQs in OFFTOPIC forum, and read the avast help/docu/FAQ’s :wink: