QUOTE(Wikipedia)
On November 18, 2008, Microsoft announced that Windows Live OneCare would be discontinued on June 30, 2009 and will instead be offering users a new free anti-malware suite called Microsoft Security Essentials to be available before then. However, virus definitions and support for OneCare will continue until a subscription expires. Users are encouraged to use Windows Live services for alternative features (such as Windows Live Photos instead of OneCare's Photo Backup feature). It is expected that the Windows Live OneCare Safety Scanner will also be discontinued as part of this announcement.
Release and download page for Microsoft Security Essentials: http://www.microsoft.com/Security_essentials/ QUOTE
About Microsoft Security Essentials
Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
Microsoft Security Essentials is a free* download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology. It's easy to tell if your PC is secure "when you're green, you're good." It's that simple.
Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want without interruptions or long computer wait times.
Not (yet) tried personally but "the reviews are good", it is said.
Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
Microsoft Security Essentials is a free* download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology. It's easy to tell if your PC is secure "when you're green, you're good." It's that simple.
Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want without interruptions or long computer wait times.
