I'd steer away from Detector and go with quality!
A-S applications (grab'em all).
The effectiveness of an individual A-S scanners can be wide-ranging and
oftentimes a collection of scanners is best. There isn't one software that
cleans and immunizes you against everything. That's why you need multiple
products to do the job i.e. overlap their coverage - one may catch what
another may miss.
SuperAntispyware - Free
http://www.superantispyware.com/superantispywarefreevspro.html
Ad-Aware - Free
http://www.lavasoftusa.com/products/ad_aware_free.php
http://www.download.com/3000-2144-10045910.html
Spybot Search & Destroy - Free
http://www.safer-networking.org/en/download/index.html
Windows Defender _ Free
http://www.microsoft.com/athome/security/spyware/software/default.mspx
Interesting reading:
http://www.pcworld.com/article/id,136195/article.html
"...Windows Defender did excel in behavior-based protection, which detects
changes to key areas of the system without having to know anything about
the actual threat."