Microsoft Security Essentials (64-bit)
A newer version of Microsoft Security Essentials (64-bit) is available.
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Full user review
"Never a issue with it"
Low impact on resources, Free, not annoying
Probably not as good as a expensive paid suite, slow to do Full Scan
Been using MSE since its beta inception and find it effective enough for most users. Although it does miss some adware or spyware I have found most of the time its not a issue. Unless you really don't take common sense measures like not surfing porn sites,or clicking on links and pop ups and fearware. I think it works for the user who needs just a little security and peace of mind.