Done a bit of playing around with AdAware2007, Asquared, and AVG AS. (All free/demand scanner versions.) It's been the source of a little controversy that these all run as services on windows startup, unless set to manual. And if AVG's is set to manual, it won't even start. The necessity of Asquared service, which doesn't use much, was adequately addressed at the Asquared forum, I think, and I'm quite happy to leave it be. AVG's (7.5.136) doesn't use much either, I haven't bothered to look/see if anyone is commenting on it. But AdAware uses 20-30 megs, 21 on my computer, and up to 30 reported on some. Seems rather too much for a demand scanner. (This is before the program is even opened, or after it's closed, BTW.) Now for the interesting part. If AVG is opened, and commanded to scan the memory, which takes two or three minutes, the mem usage of both asquared and Adaware drop. In Adaware's case, to 500Kb! In Asquared, to about 400. Haven't done this and tried a restart, yet, to see if it "holds", but I'm pretty impressed. I'd read somewhere that AVG's scanner released memory as it went, that's the most graphic demonstration I've seen of it.