Windows 7 won't activate though the serial key is valid


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I have an old laptop HP Compaq 610 that i have bought like 5-6 years ago. 

I don't even remember what the original OS was but last night i installed Windows 7 

My problem is that i cannot activate the windows getting an error "The product key you typed cannot be used to activate Windows on this computer"

I flashed the BIOS but it didn't help at all ... why i cannot activate Win7 on this model only?

Thank you so much

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If the product key is not used on another computer at all, you can call MS and have them unlock to be registered again on another PC.  Tho, if you have an PC actively using that product key, I believe Windows will not be activated on that PC anymore.  I had to do this a couple times.

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Hmm  but this is a Volume License key and i am able to install the same copy to all other machines except this one. 

I even tried to use loader (though not so good idea) but there is no loader that can kinda register win on this laptop. 

I will try with an old copy of Vista and see if it helps for a while. Will keep you updated Thx

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