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after my ssd crashed, I has to reinstall my windows, then I reentered my windows 7 64bit SP1 from MSDNAA and it says: "a problem ocurred. Error 0xC004C020"

How should I proceed?

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how many times have you used the key? – Sathya May 25 '12 at 4:07
once to activate first. Then again when I reinstalled my windows after the crash – André Cytryn May 25 '12 at 20:18

The error you refer to, Error 0xC004C020, is due to: "The activation server reported that the Multiple Activation Key has exceeded its limit." -- Microsoft Support.

The same page goes on to say the remedy or possible workaround is: "Contact the Product Activation Call Center to obtain a new MAK or to increase the activation limit on the existing MAK". Instructions on how to get the Product Activation Call Center phone number is found at this Microsoft Support page.

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up vote 1 down vote accepted

To solve this issue I clicked on the option to call the MS service and activate it. Windows gives a code, that you input on your phone and then you receive another code to input on your computer. This worked.

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You can select your answer as the correct answer. – SgtOJ May 26 '12 at 14:48
Yeah I know, just waiting for the cooldown – André Cytryn May 26 '12 at 20:42

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