Malwarebytes Anti-malware

Homepage: http://www.malwarebytes.org/mbam.php

Download link: http://www.malwarebytes.org/mbam.php

Operating Systems: Windows

Description: Antispyware with automatic updates. Completely free. There is also a full version with realtime protection, scheduled scanning, και scheduled updating.

Super antispyware (home use only)

Homepage: http://www.superantispyware.com/

Download link: http://www.superantispyware.com/superantispywarefreevspro.html

Operating Systems: Windows

Description: Antispyware with automatic updates. home use only. Email registration required. Easy to use.