which is built in to Vista, I believe, is about as basic as it gets.
For demand-only scanners, try Superantispyware and/or MBAM. Similar to AdAware, but heaps better.
I have read numerous reviews from users of the top-downloaded spyware catcher programs and can't decide on one. I downloaded Spybot, but not only did it not install completely, my computer locked-up. So I uninstalled it. Next I was going to try Ad-Aware, but there were a LOT of bad reviews. I currently use Norton Internet Security, but I want a back-up program. I use VISTA Home Premium and am just your average user. Therfore, the fewer bells and whistles, the better. Any advice?