Malwarebytes - 9.60MB (Shareware)
Malwarebytes' Anti-Malware can detect and remove malware that even the most well known anti-virus and anti-malware applications fail to detect. Malwarebytes' Anti-Malware monitors every process and stops malicious processes before they even start.

Key Features:

•     Light speed quick scanning.
•     Ability to perform full scans for all drives.
•     Malwarebytes' Anti-Malware Protection Module. (requires registration)
•     Database updates released daily.
•     Quarantine to hold threats and restore them at your convenience.
•     Ignore list for both the scanner and Protection Module.
•     Settings to enhance your Malwarebytes' Anti-Malware performance.
•     A small list of extra utilities to help remove malware manually.
•     Multi-lingual support.
•     Works together with other anti-malware utilities.
•     Command line support for quick scanning.
•     Context menu integration to scan files on demand.

Change Log:

# Improvements:
* Up to 25% faster Quick scans for 64-bit operating systems.
* Chameleon usability enhancements.
* Enhanced reliability of program updates with additional security checks.
* Password command line enhancements (paid version only).
# Issues Fixed:
* Scheduled scan logs now include accurate protection status.
* Context menu 'Scan with Malwarebytes Anti-Malware' now displays in selected language.