Storage [Q] Developer Registering Windows Phone 7.8

Hi guys...
I'm new here ,

I just knew that I can freely register my phone as a developer ... ( so I can download homebrew apps and Sideload )
So I installed WindowsPhone8SDK & ZUNE software...
When i choose the account to register with in the Windows Phone Registration tool I get an ERROR
ErrorCode : 0x64
What is the problem ?
Please help me
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