Cannot activate Windows Defender imbedded in computer at purchase

I have just purchased a Toshiba Satellite Laptop. It comes with Windows Defender but is IN-ACTIVATED at time of purchase. I have tried to activate it and also gone on line for guidance and the steps advised do not work.
I am wondering if the McAffee Anti-virus software is blocking it????
Can anyone explain to me how to activate the Windows Defender in my laptop?
Solved!
Go to Solution.

It is turned off because of mcaffee, if you turn off mcaffee you will be able to turn on windows defender.
See this thread for some explanations:
http://answers.microsoft.com/en-us/protect/forum/protect_defender-protect_start/i-cant-turn-on-windo...
S70-ABT2N22 Windows 7 Pro & 8.1Pro, C55-A5180 Windows 8.1****Click on White “Kudos” STAR to say thanks!****

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