Malwarebytes Anti-Malware free ware

Malwarebytes' Anti-Malware is a high performance anti-malware application that thoroughly removes even the most advanced malware and spyware. With one of the fastest, most effective quick scans and malware removal capabilities on the market, this program is the perfect complement to the defense of your PC. The full product contains a number of important features including the ability to schedule updates and scans and most importantly, a real-time malware protection module that blocks malicious processes before they even start.

What's new in this version:

       * Problem with users with {or} in user account names.
       * Internal bug fixes.

Quick Specs
       * Version: 1.51.2.1300
       * File size: 9.4 MB
       * Added: September 13, 2011
       * Cost: Free, paid update is available, $ 24.95 to buy (Buy Now)
       * Operating system: Windows 2000/XP/2003/Vista/Server 2008 / 7

download Malwarebytes Anti-Malware free here