How to get product key of old OS (Win 7) after upgrading to Win 10?

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  1. Posts : 1
    windows 10
       #1

    How to get product key of old OS (Win 7) after upgrading to Win 10?


    Before 2 Months, I was using Windows 7 Home Premium in my Sony Vaio Laptop which is running absolutely fine. After the release of Windows 10, I upgraded and then clean install my Windows 7 to Windows 10. But after the upgrade, my laptop becomes too slow. It takes about 10 minutes to boot and 5-6 minutes to start the application.
    So now i want to go back to windows 7 but now since its over 1 month, I cannot rollback to windows 7. So I want to perform the clean install the same old Windows 7 but I lost the Windows 7 product key that comes with my laptop. Also the sticker at the back of laptop where the product key is printed is erased.
    Now in this difficult situation, how can i get the product key of my old windows 7 in order to install it? Is it possible?
    Please help me.
    Badly regretting for upgrading my Windows 7 to Windows 10.
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  2. NavyLCDR's Avatar
    Posts : 15,508
    Windows 10 Pro
       #2

    showkey plus from this forum:
    Showkey - Windows 10 Forums
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  3. Cliff S's Avatar
    Posts : 25,548
    Win10 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #3

    Sorry but that won't work if he clean installed after upgrading and has an OEM license. It only say you have an OEM Marker.
    How to get product key of old OS (Win 7) after upgrading to Win 10?-image-1.png
    It only shows the generic install key for Win10
    On windows 7 machines there is no key in the mother board BIOS.
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  4. NavyLCDR's Avatar
    Posts : 15,508
    Windows 10 Pro
       #4

    Cliff S said:
    Sorry but that won't work if he clean installed after upgrading and has an OEM license. It only say you have an OEM Marker.

    It only shows the generic install key for Win10
    On windows 7 machines there is no key in the mother board BIOS.
    Oops. I missed the OP where he said he did a clean install after the upgrade. Yep, you are correct, the previous Windows 7 Product key is gone - unless the OP made a backup image of the Windows 7 or first Windows 10 after upgrade, which they would just restore, so there probably was no backup done.
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  5. Cliff S's Avatar
    Posts : 25,548
    Win10 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #5

    Maybe by posting his forums handle with the "at" sign, @Superfly can help:)
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  6. lx07's Avatar
    Posts : 5,479
    2004
       #6

    SunilKunwar said:
    Also the sticker at the back of laptop where the product key is printed is erased.
    That is the only one you need for 7. You was ripped-off.

    Later versions had a key in BIOS but 7 didn't.

    If you have not bought a legit version (and someone has scrubbed off the original OEM number) then you'll have consider buying a new license from MS.

    I get given lots of laptops to "repair" which people have bought from a "reputable" seller (from a local shop or ebay or whatever). In fact I've never seen one that was genuinely activated. Never.

    As you can't validate your 7 you can't expect your upgrade to be valid.
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  7. Kari's Avatar
    Posts : 17,434
    Windows 10 Pro
       #7

    The thing is, even if you could retrieve the product key of the underlying OS, it would be useless. If a valid 7 or 8.1 was upgraded to 10 and the 10 automatically activated, the underlying 7 or 8.1 key is flagged as used and can't be used to activate 7 or 8.1 on another machine.

    The key of an underlying qualifying OS is gone and invalid as soon as the upgrade to 10 has been activated.
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  8. Superfly's Avatar
    Posts : 3,328
       #8

    You guys are correct - Windows 7 requires to be restored from a backup that includes the relevent certificate as the key is an OEM generic. (BTW. ..I don't think it's pirated - they would go for Ultimate instead.)

    @SunilKunwar - PM me the following registry key - and we'll see if we can set your PC back to factory.

    HKEY_LOCAL_MACHINE\HARDWARE\ACPI\RSDT

    It contains the OEM marker version in order to match the correct certificate.

    (NB: I will respond via PM as it requires Sony proprietry stuff to be installed - which was there prior to your upgrade anyways, but still.)
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  9. Cliff S's Avatar
    Posts : 25,548
    Win10 Pro, Win10 Pro N, Win10 Home, Windows 8.1 Pro, Ubuntu
       #9

    Thanks for showing up Craig
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  10. NavyLCDR's Avatar
    Posts : 15,508
    Windows 10 Pro
       #10

    Kari said:
    The thing is, even if you could retrieve the product key of the underlying OS, it would be useless. If a valid 7 or 8.1 was upgraded to 10 and the 10 automatically activated, the underlying 7 or 8.1 key is flagged as used and can't be used to activate 7 or 8.1 on another machine.

    The key of an underlying qualifying OS is gone and invalid as soon as the upgrade to 10 has been activated.
    100% complete and utter nonsense.
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