Microsoft security essentials (codenamed Morro) is a free anti-virus software from Microsoft which is finally out of beta and available to download for Windows XP, Windows Vista, and Windows 7 users. Microsoft Security Essentials provides real-time protection for your PC by protecting it from viruses, spyware, and various malicious software.
Microsoft Security Essentials is compatible with all versions of Windows XP, Windows 7 and Windows Vista but it is not compatible with Windows XP 64-bit edition.
Download link for free Microsoft security essentials for Win XP, Win 7 and Win Vista: To download Microsoft security essentials for Windows OS head over to this link first: www.microsoft.com/security_essentials/.
Now select your language and the Windows OS you are running on your PC to start downloading Microsoft security essentials.
Note: Your PC must run genuine Windows to install Microsoft Security Essentials.