Microsoft Security Essentials Final Is Releasing Soon

Microsoft Security Essentials (MSE) is an anti-malware product that works via the cloud, a successor to OneCare, and contains quite a bit of promise. The beta versions had a strong ability to detect and remove malware, and as the product grows, its strength will only increase as more and more users automatically submit telemetry to the cloud. Even so, MSE already has a strong base, with 400,000 testers during the beta release.

Here is The Microsoft's Official Page

MSE will also be completely free (assuming that your operating system passing the WGA test), matching the company’s belief in anti-virus software. The program is mainly being marketed as a lightweight, effective solution especially meant for those who do not currently have existing protection (estimated at 50-60% of users) or consumers whose anti-virus suite has expired, leaving them open to attacks by malware.
As for the release date, according to a message sent to participants of the beta, Microsoft plans to release the final version of MSE soon: “the final version of Microsoft Security Essentials will be released to the public in the coming weeks.” In the meantime, feel free to give the beta a try, and potentially helping to improve the product:

Just make sure that you meet the system requirements, as outlined by the Redmond giant on the official page for Security Essentials:

Operating System: Windows XP (Service Pack 2 or Service Pack 3); Windows Vista; Windows 7 (Beta or Release Candidate)
Windows XP:
CPU with clock speed of 500 MHz or higher
Memory: 256 MB RAM or higher
Windows Vista and Windows 7:
CPU with clock speed of 1.0 GHz or higher
Memory: 1 GB RAM or higher
VGA (Display): 800 x 600 or higher
Storage: 140 MB of available hard-disk space
An Internet connection.
Internet Browser:
Windows Internet Explorer 6.0 or later
Mozilla Firefox 2.0 or later
 
Source:http://windows7news.com/2009/09/22/microsoft-security-essentials-final-on-the-way/