AD-Aware SE scans your PC looking for hidden spyware and will securely delete them. AD-Aware SE can find and delete Cydoor, CommonName, Gator, and Alexa files among others.
You can download the latest update from the AD-Aware SE database with the latest known spyware:
AQUÍ
You can download a patch to translate AD-Aware SE easily into Spanish, Portuguese, Italian, Catalan ... and various others.
AQUÍ
This version is totally free for non-commercial use, although it has some disabled options with respect to the pay version.