Visit http://www.microsoft.com/security_essentials and click on the Download Now button.

Select your lanuage then click on your operating system. The choices are WIndows XP 32 bit, Windows Vista/Windows 7 32 bit and Windows Vista/Windows 7 64 bit. If you're not sure whether you have a 32 or 64 bit system, you should check with your computer manufacturer.

You can either Run the file to start the installation immediately, or you can save the installation file to a folder on your computer then open it manually to start the installation wizard.

Click Next.

Click I accept.

Okay, so there was a catch. Microsoft will not install the Security Essentials software until it validates your copy of Windows. As long as you own a legal copy of Windows, this shouldn't be a problem.

Wait while your Windows installation is validated.

Click Install.

Click Finish.

After installation, Microsoft Security Essentials will install the latest virus and spyware definitions.

After the update, your computer status will be set to "Protected."
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