Please look into the issue and comment posted by one of the member in article
http://www.c-sharpcorner.com/UploadFile/suthish_nair/windows-defender-virus-and-spyware-definitions-update-fail/#ReadAndPostComment
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Suthish NairPosted Apr 18, 2013, 8:05 AM
Riddhi ValechaPosted Apr 18, 2013, 7:49 AM
Well.... I have never used Windows Defender.
I guess there are following options-
1)Download and install the updates.
2)If the internet connection is proper, then uninstall the Windows Defender and reinstall it.
3)If no solution helps, use other antivirus.