Spybot - Search & Destroy
Full user review
"Nothing but a failure in testing!"
100% ineffective in PC Magazine tests!
Stick with Malwarebytes or Emisoft Antimalware, they have good, Emisoft, excellent, Malwarebytes test results!, Emisoft also has a new version with a dual scanning engine, and has partnered with a leading company, the new version of Emisoft was released on 2-1-2013,
I hope this information will be of some use when choosing an effective antimalware for free to scan you pc with!