Windows 10: Hard disk crashed so reinstalled windows, however windows key is not working

hi, my hard disk has crashed, i had to install windowswhen i input the key, the same is not workingI have the old installed copy on my hard disk which i recovered using recovery tools. can i recover the key from that

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Windows Image to reinstall windows?

Is there a way to get a windows 7 professional image on a DVD so i can reinstall windows on a new hard drive in a clients laptop? I have ultimate and home retail discs but her laptop came with professional, so i need a image so i can just use her key.

 

how to reactivate windows 10 when hard disk get crashes and not having product key?

I have dell Vostro series laptop. My Laptop hard disk get crashed. I change hard disk hdd to ssd but in new hard there no windows 10 OS. I don't have the product key? Laptop come with pre installed operating system. please suggest me getting the product
key and activating the windows.

 

Windows 7 not genuine problem

It seems like that's an OEM windows copy, it will do that the every time you reinstall the OS. If you have the key, next time you see the "not genuine windows copy" click it and choose to activate by phone, everything else is pretty straight forward as it explains step-by-step. If it doesn't work, then its highly likely that you got a Pirate copy.