SuperAntiSpyware Free Edition
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Full user review
This is also another program that I have joined for many years for detection and improvement. This program has good settings that give you very specific scanning options. It has a very rootkit and spyware remover.
Need to keep their release logs up to date. The current version on cnet is not the up to date one. Go to superantispyware.com and get the latest or download it through sas itself.
Along side your current AV, I recommend this as #2 for a side addition (#1 is mbam).