cannot activate windows 7 home premium

Back in August of 2015 I re-installed windows 7 home premium for a customer.  a couple of days ago she brought the laptop back because the product key no longer was working,  Windows is saying that the product key is not Genuine.  I have tried at least 4 different keys and none of them work.  Is there something to do so that a product key will work?
Will Schmidtowner Asked:
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JohnBusiness Consultant (Owner)Commented:
If you cannot get a Key to work, then you must reinstall Windows again and before you do, ensure the Key is good.
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RaminTechnical AdvisorCommented:
Open the command prompt as administrator and type or copy paste  SLMGR -REARM (note that there is a space between dash and R).
Hit Enter.
Click on Ok to restart your pc.


Try Belarc Advisor to find the Product Key.
http://www.belarc.com/free_download.html
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Alan HendersonRetired marine engineerCommented:
You need to contact Microsoft's activation Centre:
In the USA I think that's Windows activation: (888) 571-2048. They'll talk you through the reactivation process.

Different countries hae different call numbers. Where are you?
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Will Schmidtowner Author Commented:
I contacted the activation centre and gave them one of the keys that I attempted to use (it was one that was on another old laptop that had been discarded and they told me that key was not a genuine key - even though it was the original key that came with the laptop when it was purchased new)

  -- Im going to try the suggestion from lvl 23

 I am trying everything else before I re-install as this customer has programs on her laptop that would cost her money to replace.
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JohnBusiness Consultant (Owner)Commented:
Did the customer not keep their programs?  Bad move on their part.

If the Licensing center won't activate it, then it is not likely any other way will activate it.
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Alan HendersonRetired marine engineerCommented:
Generally, laptop and proprietary PC activation keys are OEM (original equipment manufacturer) and are not transferrable to a different machine.

You may need to bite the bullet and buy a licence.

:)
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JohnBusiness Consultant (Owner)Commented:
That is a decent idea, but hard because Microsoft will not sell these anymore. eBay may be one source however
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Alan HendersonRetired marine engineerCommented:
Licences cost very little: see here.
see here
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RaminTechnical AdvisorCommented:
I'm agree with the above. if that Product Key has been discarded by Microsoft then you cannot use it anymore and that command also will not help you.

Instead of that command try this:

slmgr.vbs /ipk [YOURKEY]
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Will Schmidtowner Author Commented:
Ramin, your solution worked!  and the product key that Microsoft Activation center said was invalid is the one i tried!  I don't know what's up with them folks at the activation center but looks like to me you need to help them out a little.
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