malwarebytes
Malwarebytes Anti-Malware’s industry-leading anti-malware and anti-spyware scanner detects and removes malware like worms, Trojans, rogues, spyware, bots, and more. Anti-rootkit technology drills down and removes deeply embedded rootkits, one of the most dangerous forms of malware.
If you’ve got malware on your computer, Malwarebytes Anti-Malware will destroy it. Restoring your computer to its former glory.
Use the free version, use manual updates and scan your computer once a week.