Avast Home Edition
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Full user review
"Best anti-virus out there"
It is so easy to use. Install it and allow it to scan your drives when it does a required reboot and you can pretty much forget about ever having a virus on your system. They update their virus files more often than anyone else in the industry. It is always such a good feeling each and every day when you hear that friendly voice saying, "Virus database has been updated". Best of all it is free for home user with only a registration required to give you a 15 month subscription to virus database updates.
There is nothing to dislike about this program. It doesn't hog system resources and does a great job.