

Once you grab the setup file you need, just double click on it and follow the on-screen instructions to apply the latest definitions to Microsoft Security Essentials. One important thing is to download the correct definitions for your system’s architecture: 32-bit or 64-bit.

Microsoft Security Essentials updates its virus definitions using Windows Automatic Update.

Microsoft Security Essentials (MSE) provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
