@Para-Noid: I always thought the boot-time scan is/was more effective than a full scan and, because of that presumption, I use that exclusively in lieu of the full scan. However, since I keep seeing recommendations to not use it until prompted to do so (by Avast), I must ask "why do many recommend the full scan over the boot-time scan?" Also, "what benefit does the full scan offer that is absent from a boot-time scan?" BTW, the time to complete either or is not a decisive factor for me.