Virus and spyware definition update file for Microsoft Security Essentials

For Microsoft Security Essentials

1. Download the Microsoft Security Essentials virus and spyware definition update file that is appropriate for your version of Windows:
   • To download the file for a 32-bit (x86-based) version of Windows, click the following link:
     http://go.microsoft.com/fwlink/?LinkID=87342
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   • (http://go.microsoft.com/fwlink/?LinkID=87342)
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   • To download the file for a 64-bit version of Windows, click the following link:
     http://go.microsoft.com/fwlink/?LinkID=87341
     
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   • (http://go.microsoft.com/fwlink/?LinkID=87341)
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   Note You must be running a 64-bit version of Windows to run a 64-bit version of Microsoft Security Essentials. 64-bit versions of Windows include x64-based versions of Windows.