Today Microsoft Corporation Released Windows Security Essentials. A free solution for Genuine users of Microsoft Windows XP, Windows Vista and Windows 7 operating system.
The product is lightweight, fast and will be updated by windows updates. The product is a stripped down version of the paid Windows Live Onecare product that Microsoft announced it would be discontinuing. The backup, multicomputer and firewall features have been removed from the Onecare product to make up Security Essentials.
Still a very compelling download if you are using some other free third part antivirus software.
You can download and get Windows Security Essentialst at:
Note for those of you who use Grisoft AVG it installed right along side my AVG on my Windows 7 Installation without issue. Pretty cool. Trend Micro has yet to release a Windows 7 client for their SMB client suite so I can't say if it plays well.