Microsoft Security Essentials
A newer version of Microsoft Security Essentials is available.
This download is served from an external siteclose
NOTICE: This link will open a connection to a third-party site. CNET cannot ensure the security of software that is hosted on external sites.
Full user review
"Underserving of Bad Reviews"
Basically Microsoft Forefront Security for home, updates multiple times during the day, doesn't slow the computer down, VERY secure, easy to use for the not tech savvy person, FREE. NOTE: this is windows defender in Windows 8
Scans can be long if not configured right, must have a backup like Malwarebytes
I have been using MSE for about a year now. Previously during version 1, I had been using MSE but was unimpressed and went to back to AVG. After AVG I switched to Avast (when is was version 5) because AVG was SLOW, and had missed a couple infections. Once Avast updated to version 7, all of the PC's I had it installed on became noticeably slower. Avast also installed an annoying amount of crap like Google Chrome, Webrep, and a few extra shields. After I saw MSE 4.0 was released on CNET I gave it a try, and loved it. I have used it to remove viruses that Avast would have never caught, and even ones on friends and family members PC's who had Norton 360 (in fact it found 10 Trojans that Norton missed on the one.) Personally, I have had it block me and my immediate family from a few "severe" infections. MSE even breathed new life into an old Pentium 4 with XP that I couldn't figure out why it was slow. Since you should switch to MSE, be sure to also download Malwarebytes in case anything should get past MSE. A fix for the long scans is to uncheck limit CPU usage during a scan. Overall, I would not use any other antivirus program but MSE.