Microsoft Security Essentials
A newer version of Microsoft Security Essentials is available.
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Full user review
"Good Anti-Virus (you should also install anti-malware)"
I am a tech guy. I regularly install MSE for anti-virus & anti-rootkit protection combined with Malwarebytes with real-time protection for anti-malware. These two programs combined do a darn good job together with a small performance footprint and low cost. However, either alone cannot protect your computer. MSE cannot be installed with other anti-virus programs ... it is a recipe for failure. This is pretty much true for all anti-virus programs, pick one.
I would have ranked MSE with 5 stars except for one new HUGE problem. Microsoft and others have been bought off by Babylon and IAC to ignore their Malware programs. Microsoft has joined this campaign to victimize uninformed PC users to allow ad-supported unwanted Malware. Don't believe what they say that Babylon and IAC's software cleaned up their malware characteristics. It is not true... Microsoft, Malwarebytes and many of the other big players are being paid off with our ad dollars. I spend countless hours (paid) removing this junk from people's computers. MSE, Malwarebytes, Norton, Kaspersky, etc. will not flag it anymore. BS. Look at Babylon's website or IAC's software websites. Prominent link is how to remove their malware software... And it is not easy. Get serious Microsoft -- do they pay you enough?