By default, Microsoft Security Essentials is designed to install and run updates automatically. If you have disabled this feature or if you encounter problems updating automatically, you can manually download and install the latest Microsoft Security Essentials definition updates for your computer.
The latest virus definition version is: 1.139.1329.0 | Released: Nov 05, 2012 05:30 AM UTC
Get the latest definitions
 | AM - 32-bit | 64-bit | ||
| 32-bit | 64-bit | ||
 | Instructions | ||
 | Windows 8 - 32-bit | 64-bit | Windows XP/Vista/7 - 32-bit | 64-bit Instructions |
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