Lavasoft Ad-Aware used to be known (probably still is) to "overlook" the infestation if one can stimulate them high enough.
Spybot - Search & Destroy, is a nice thing. ComboFix is an "upgrade" of spybot - much more faster method of detection.
At this moment I know for at least one problem that F-secure can not but ComboFix can detect and remove.
FREE Anti Whatever can be worse than nothing.
Read about enumerating badness
http://www.ranum.com/security/comput...itorials/dumb/
Only you can protect yourself - by thinking first, acting later
No pill, vaccine or anti virus program can do it for you.