
When the program successfully installs, you should see the message, You have successfully completed the Security Essentials Installation Wizard. Confirm that you don't have any other anti-virus programs installed, then select Install. Check the box for If no firewall is turned on, turn on Windows Firewall and select Next.
Select Join the Customer Experience Improvement Program and then Next.Read through the Software License Terms, and select I Accept.
Once the installer extracts and runs, select Next. You may get a pop-up box asking you to "allow the following program to make changes to this computer." Select Yes. Once the download finishes, double-click the file to run the installer. If your computer is running a 32-bit operating system, download the ENUS\x86\MSEInstall.exe option. If your computer is running a 64-bit operating system, download the ENUS\amd64\MSEInstall.exe option. Download Microsoft Security Essentials from the Microsoft site. Once you have determined which operating systems version you have installed, download and install the corresponding version of Microsoft Security Essentials. Under the System heading, you can view the system type. Open the System Properties by selecting the Start button, right-clicking Computer, and then selecting Properties. Instructions Identify If You Have a 32-bit or 64-bit Version To install Microsoft Security Essentials on Windows 7, follow these steps.