Updating the definitions is necessary to
make Windows Defender to be able to identify and remove more viruses and
spyware. For default, Windows Defender updates the definitions
automatically from internet, but you can also update it manually on a
computer without a working internet connection. New definitions updates
are available daily.
Latest Definitions:
Latest Definitions:
- For 32 bit operating system: http://go.microsoft.com/fwlink/?LinkID=121721&arch=x86
- For 64 bit operating system: http://go.microsoft.com/fwlink/?LinkID=121721&arch=x64
- For Windows RT: http://go.microsoft.com/fwlink/?LinkID=121721&arch=arm
