Microsoft Security Essentials 2.1.16 Final (32bit / 64bit)

Microsoft Security Essentials (codenamed Morro) is a free antivirus software created by Microsoft that provides protection against viruses, spyware, rootkits, and trojans for Windows XP, Vista, and 7. Microsoft has always recommended that its users use real-time antimalware protection, but the release by the end of this year will mark the company's first free solution. MSE replaces Windows Live OneCare — a subscription antivirus service — and Windows Defender, which only protects users from adware and spyware.
MSE is a small-footprint program ideal for computers that lack processing power or broadband Internet connections, such as netbooks. MSE is available as standalone 32-bit and 64-bit downloads for Windows XP, Windows Vista, and Windows 7. It's very easy to install Security Essentials using it is even easier than one might expect.
Updates and upgrades are automatic, so there's no need to worry about having the latest protection. It's easy to tell if you're protected – when the Security Essentials icon is green, your status is good. It's as simple as that. 

Updates are published 3 times a day to Microsoft Update. Using default settings, archived files are decompressed, and then scanned. File downloads and e-mail attachments are also scanned. Its Dynamic Signature Service attempts to better identify malicious files by checking for updates if an application exhibits suspicious behavior. Before taking action against a suspect file, MSE prompts for user input. If no response is received in 10 minutes, then the suspected malware is handled according to its default action, letting MSE determine what to do with the malware. System Restore points are created before removing found malware.
  

 Features of Microsoft Security Essentials:

Remove most-prevalent malware
Remove known viruses
  Real-time anti-virus protection
Remove known spyware
  Real-time anti-spyware protection 

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