Spybot Search & Destroy (SSD) has some advanced tools that are good for the advanced user. (It lets you get at programs that start with Windows--and stop them, if you want--in a way that Windows sometimes doesn't.) It's a pretty good scanner. I have used it for years and have it installed on all of my PCs.

SuperAntiSpyware (SAS, also free) does a better job at its core task of removing malware. It also has a little-known tool. At the lower left of its main window there is a link which, when clicked, will tell you all the programs you have installed along with security ratings of each.

HTH,

Richard

"My primary musical instrument is the personal computer."