WinPatrol
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Full user review
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"Very neat program!"
Pros
Lightweight, can be set to delayed start as to not lag a weak system. Has a powerful HIPS set up that is capable and set to catch just about any change to the system. I haven`t had a virus or suspicious process to initialize since I installed it. I have Malwarebytes along with avast antivirus, but I rarely need to rely on Malwarebytes protection module anymore. Catches most registry and startup changes immediately as they are occuring. The plus version I hear has real time protection. Hardly uses any RAM.
Cons
Sometimes it seems paranoid, but it is worth it.
Summary
Between this and PrivateFirewall, I would definitely install this first, both are good, but this is excellent.