Zone Alarm, SpyBot, Ad-Aware and Symantec Anti-Virus
I had used Spybot-S&D before, and given up on it. I just downloaded and tried it again, due to the two recommendations above for it. I am removing it again.
Spybot S&D brought up some dialog boxes that were misdisplayed (perhaps my screen font size confused it), so that I could not select a Yes/No to agree with some installation actions of Ad Muncher. I had to uninstall both, and reinstall Ad Muncher without Spybot S&D interferring. But Spybot S&D wouldn't exit cleanly - kept bringing up some window saying it couldn't exit once a minute, and refused to go away until I killed it. Also the Spybot S&D menus and installation questions I found most confusing. And it falsely claimed I had the CoolWWWSearch spyware due to the redirects in my hosts file of the CoolWWWSearch URL's to 127.0.0.1 (to disable them entirely). And one of the sites I read a couple hours ago recommended against using Spybot's resident TeaTimer - saying it was causing problems (sorry - I've forgotten the details and the URL.)
All in all not a good start for Spybot S&D - back into the bit bucket it goes.
But Ad Muncher, SpywareBlaster, and Spyware Doctor all look good. SpywareBlaster and Spyware Doctor were both rated 5 of 5 on the site: Spychecker.com, which seems at first glance to be one of the more useful spyware web sites I've seen.