Spybot - Search & Destroy
Full user review
"Ancient Antispyware, Pristine Definition Database"
This is one of the BEST scanners, you don't even need to use its Resident Protection, It FOUND THINGS other popular software could not find, such as SuperANTISPYWARE, Malwarebytes, Microsoft Security Essentials, and many other popular software. This is a MUST HAVE if you are infected, it can find many things others miss.
Nothing negative, but having the Internet Bad Blocker on without Resident Protection is a good idea, since its Resident Protection isn't that good at all.