
As a home user, you may not use the software in any commercial, non-profit, or revenue generating business activities. If you are a home user, then you may install and use any number of copies of the software on your personal devices for use by people who reside in your household. Having shown you how to do this I would like to call attention to the following excerpt from the Microsoft Security Essentials EULA:

Fortunately for us, we can use Group Policy Preferences to bypass the OOBE wizard. Sometimes you might not want to expose your users to that. In other words every user that logs on to a machine deployed from your image will see the MSE OOBE Wizard (Figure 1-2), until someone with Administrator privileges completes the wizard. If you decide to use MSE in your images, you will discover that sysprep resets the Out Of Box Experience (OOBE) settings for MSE.

In smaller deployments Microsoft Security Essentials (MSE) is a good, free alternative for anti-malware.
