Malwarebytes is one of the kings when it comes to programs that hunt down and kill the nasty spyware and malware you can pick up in your daily surfing. It's been a while since a new version has hit, but now they have made the beta of version 1.50 available to the public.
Some of the new features for the free version are improved program loading and scan speed, a warning for an out of date database to remind you to update, and more details about infections such as the type, port, and process. The paid Pro version has many updates to the real time scanning side as well. Download info is available at the Source Link.