Microsoft Security Essentials and Windows Defender Installation
Installing Windows Defender on Windows 8 and Windows 10
Windows Defender comes pre-installed on Windows 8 and Windows 10 computers.
University of New Hampshire faculty and staff should use System Center Endpoint Protection for Institutionally Owned computers.
Installing Microsoft Security Essentials on Windows Vista and Windows 7
Microsoft Security Essentials (MSE) is a free antivirus/malware tool developed and distributed by Microsoft for Personally Owned computers for Windows Vista and Windows 7 computers (see FAQ).
University of New Hampshire faculty and staff should use System Center Endpoint Protection for Institutionally Owned Windows Vista and Windows 7 computers.
Requirements for Microsoft Security Essentials
- Windows Vista (64-bit or 32-bit)
- Windows 7 (64-bit or 32-bit)
Remove Existing Antivirus Programs
Before installing MSE, it is important to make sure you do not already have another antivirus program installed.
Click here to download.
Microsoft recommends backing up data and ensuring Windows is fully up to date prior to installation. For instructions on how to back up data, please visit this page.
- Download the installer to desired location on your computer. The installer can be downloaded from Microsoft here.
- Locate the Installer (mseinstall.exe) and double click it.
- Open the installer. Windows Vista and Windows 7 users should right click the installer and choose Run as administrator.
- The installer will open. Click Next.
- You will be asked to “Join the Customer Experience Improvement Program.” Joining is optional. Click the Learn more link if you are interested. Choose your preference and click Next.
- Choose whether or not you want your firewall turned on and click Next.
- Select Install to start the installation process.
- Once the installation is complete, it will ask you if you want to scan your computer. Select your choice, and click Finish.
- Microsoft Security Essentials is now installed, active, and ready for use. Refer to Microsoft Security Essentials Usage for information on how to update your definitions, scan your computer, and remove malware.