Problem with Windows Defender

Tried to contact Ms IT Support via Live Chat advisor instructed me to copy link to Ms Tech Help.
Attempted to copy link to Microsoft Office and it came up JavaScript void().  Which was not true statement Java up to date and fine but it would not let me paste link.
Wanted to ask about Windows Defender updates as received the following caption
The Computer then froze and took away ALL DESKTOP ICONS.  Had to reboot and start again any ideas as Windows 8.1 is my installation. very concerned as product seems to be unstable.

Any Prior security software? Most of the laptops/PCs comes with norton mcafee trials, . In that case you have to uninstall all of them.. use below list and appremover
 List
of anti-malware product removal tools
Remove all other real time antivirus http://www.appremover.com/download
See
Windows
Defender on Windows 8 - Introduction and Frequently Asked Questions
After having a through review of above wiki, if everything is in order yet you cant use defender 
You may consider reset of windows
There is no way to install/reinstall Defender in windows 8.1. and also Sfc/scannow is less efficient in such event..  http://windows.microsoft.com/en-us/windows-8/restore-refresh-reset-pc
Most of the time reset may do the job. 
If problem persists, I would recommend you to get assistance from windows defender consumer forum http://answers.microsoft.com/en-us/protect/forum/protect_defender?tab=Threads
Hetti Arachchige V Aravinda | Network & System Administrator (B.Sc,MCP, MCTS, MCSA, MCSE,MCITP, CCNA, CEH, MBCS)| http://www.windowstechinfo.com |

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