Spybot - Search & Destroy
Very good
Full user review
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"Great product, prevents Startup being altered"
Pros
Been using for several years. Good solid product that prevents Startup processes to be altered unknowingly. I have it running at bootup time on 2 desktops and one laptop and have not noticed any slowdown in processes.
I run a scan about every other day and after the first few days, system has remained clean. Note: I also run CCleaner and ASC daily, and Malware and Super Anti about once a week (alternating).Cons
Wish it would automatically do the updates, since it is brought up at bootup time, as well as automatically do the Immunize.
Summary
Great product; has caught several attempts to update Startup without my knowledge.