Malwarebytes

Malwarebytes is one of those apparently simple programs that detect and get rid of viruses, spyware, trojans, worms and other dangerous files and that prove very useful, especially when used in conjunction with your regular antivirus.

Malwarebytes works by monitoring the system's processes, stopping those which it identifies as malicious before they execute. The program has two scan modes, on is superficial and the other is a deeper, more thorough, scan that will take more time but in return will prove more trustworthy. Plus, it also comes with a memory protection module that avoids any potentially dangerous process from using the memory, as well as quarantine lists to examine suspicious elements.

Apart from all this, Malwarebytes also includes a few minor options, such as File-Assassin (to eliminate files blocked by Windows) that can prove helpful when trying to get rid of the malware once it is detected.