MICROSOFT DEFENDER ANTIVIRUS

Download the latest updates or definitions for your Microsoft Windows Defender security software
This package will help you install the latest Windows Defender definition updates.
If you encounter problems while trying to install definition updates for Windows Defender, you can download the latest definition update for computers running a 32-bit (x86-based) or 64-bit version of Windows.

DOWNLOAD FIRST SETUP THEN DOWNLOAD DEFINATION

 DOWNLOAD FOR XP,VIST AND 7 |  DOWNLOAD FOR WINDOWS 8