I use AVG by Grisoft. (Installed, but not running all the time.)
Once a week I also use an online (free) virus scanner like
BitDefender and sometimes RAV.
I've found this to work VERY well; for the last six
months I've been using this bunch of programs:
+ AVG
+ Zonealarm (without popup-/content filtering)
+ MyIE2 browser
+ CookieJar:
http://www.jasons-toolbox.com/cookiejar.asp
+ Adaware (not running Ad-watch)
+ HTAstop:
http://www.nsclean.com/freebies.html
+ SpywareBlaster:
http://www.wilderssecurity.net/spywareblaster.html
+ DCOMbobulator:
http://grc.com/freepopular.htm
But, of course, it depends very much on the settings used.
Take care all!
/H