MalwareBytes Anti Malware

MalwareBytes Anti-malware is a spyware and adware remover that boasts a fast scan and strong detection and removal rates. This is a simple program with a clean, user-friendly interface and some nice extra features. Notable among these are individual file scanning and a network drive scanner.

This is a free version of a retail program, and so has fewer features than the pay version. In particular, this one does not offer real-time protection or a scan scheduler unless you're willing to pay for it. In general, though, if you're looking for a program that does one thing and does it well, you can't go wrong with MalwareBytes.