Learn how to manually download new antivirus and spyware definitions for Microsoft Security Essentials (MSE).
Manually Download Latest MSE Definitions
Note: Choose to save the definitions file when downloading it. Don’t forget where you saved it!
- Download the latest 32bit Microsoft Security Essentials virus and spyware definitions installation file.
- Download the latest 64bit Microsoft Security Essentials virus and spyware definitions installation file.
Install Downloaded Definitions
Windows 7, Vista
Right-click the downloaded definitions file and then select Run as administrator.
Windows XP
Simply double-click the downloaded definitions file while logged in as a user with administrative privileges.
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