Free Antivirus software by Microsoft in its beta stage is now available for download officially. It’s limited public beta is released restricting 75,000 downloads. Microsoft Security Essentials replaces Windows Live OneCare, and supersedes Windows Defender. It’s targeted at users who can’t pay or simply won’t pay for a security product.

If you are interested in getting a free copy of its beta version then, head on to Microsoft MSE site. Once, you register yourself on Microsoft Connect website, you will be taken to MSE survey page but if you are not from US then you can directly go to to MSE beta survey page directly to register for the public beta.

Microsoft Security Essentials is available for Windows XP, Windows Vista, and Windows 7 (both 32-bit and 64-bit for later two). Most importantly, the Windows operating system must be genuine and legit, and can pass the Windows Genuine Advantage (WGA) validation.

For those, who are not lucky enough to get the download by invitations or fails even to register on site, here are Download Links for Direct downloading Microsoft Security Essentials version 1.0.2140.0 which is newer than MSE version 1.0.1407.00 what is served for download by Microsoft in the name of Beta.

Download : MegaUpload | DepositFiles

You can download like as a premium user using a simple trick of by-passing Megaupload download waiting time.