Window Defender Update Error

Is there anyone there who can provide an answer as for why I cannot update my Windows Defender. It states that because of internet connection failed but before when I was using my PC it easily updates but now since when I upgraded it from Windows
8 to Windows 8.1 the whole problem about this updates start.

Try to update manually only once.. download definition file from here and double click it in your pc 32-bit | 64-bit
http://www.microsoft.com/security/portal/definitions/adl.aspx
How to determine whether a computer is running a 32-bit version or 64-bit version of the Windows operating system
Then try to update regularly.. By any chance do you have another realtime protection or antivirus/security product? 
Check this  general troubleshooting steps 
How to troubleshoot definition update issues for Windows Defender>
http://support.microsoft.com/kb/918355
Check this wiki article for all the requirements of defender... 
Windows Defender on Windows 8 - Introduction and Frequently
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