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According to WikipediaMicrosoft Security Essentials does not run on Windows 8, which has an antimalware subsystem of its own. Guess what, they’re wrong!

Why Microsoft Security Essentials?

This is not an official updater! The MSE files have not been modified!
It supports Windows 8 RTM build 9200, but may work with older versions too.
The author is not responsible for any damages this mod may cause to your system.

Official MSE Beta Installer:

Microsoft Security Essentials 4.0.1111.0 Beta (x64): link 1 link 2 link 3
Microsoft Security Essentials 4.0.1111.0 Beta (x86): link 1 link 2 link 3

Unofficial MSE First Ever Installer for Windows 8:

Microsoft Security Essentials 4.1.522.0 Final (x64): link 1 link 2 link 3
Microsoft Security Essentials 4.1.522.0 Final (x86): link 1 link 2 link 3

Unofficial MSE First Ever Uninstaller for Windows 8:

Microsoft Security Essentials 4.1.522.0 Final (x64): link 1 link 2 link 3
Microsoft Security Essentials 4.1.522.0 Final (x86): link 1 link 2 link 3

Installation Guide:

  1. Install Microsoft Security Essentials 4.0.1111.0 Beta x64 or x86.
    Run this program in compatibility mode for Windows 7.
  2. If you see an error message: “A newer version of Security Essentials is already installed on your computer.” Download/unpack and Double click on a “MSE_unregister.reg” file and try to install it again.
  3. Install Microsoft Security Essentials 4.1.522.0 (x64 or x86)
  4. Double click on a “MSE_register.reg” file and run Microsoft Securite Essentials.

Uninstall Guide:

Microsoft Security Essentials 4.1.522.0 can’t be uninstalled in ordinary way, please download and run the unofficial uninstaller from First Ever.

  1. Run Microsoft Security Essentials 4.1.522.0 Uninstaller (x64 or x86)
    as administrator  (right-click: Run as administrator)
  2. Open: “Control Panel” -> “Programs” -> “Programs and Features”
    Uninstall (Remove Only): “Microsoft Security Essentials”

Please register on my website and if you have any questions, feel free to leave a comment!

Author: Marcin Grygiel aka Marcin-prv

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