Page 1 of 8 123 ... LastLast

  1. Join Date : Oct 2015
    Posts : 1
    windows 10
       09 Oct 2015 #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.
      My System SpecsSystem Spec


  2. Join Date : Jul 2015
    Posts : 6,332
    Windows 10 Pro
       09 Oct 2015 #2

    showkey plus from this forum:
    Showkey - Windows 10 Forums
      My System SpecsSystem Spec


  3. Join Date : Feb 2015
    Bamberg Germany
    Posts : 13,379
    Microsoft Windows 10 Pro 64-bit 14393 Multiprocessor Free
       09 Oct 2015 #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.
    Click image for larger version. 

Name:	Image 1.png 
Views:	94 
Size:	9.1 KB 
ID:	41881
    It only shows the generic install key for Win10
    On windows 7 machines there is no key in the mother board BIOS.
      My System SpecsSystem Spec


  4. Join Date : Jul 2015
    Posts : 6,332
    Windows 10 Pro
       09 Oct 2015 #4

    Cliff S said: View Post
    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.
      My System SpecsSystem Spec


  5. Join Date : Feb 2015
    Bamberg Germany
    Posts : 13,379
    Microsoft Windows 10 Pro 64-bit 14393 Multiprocessor Free
       09 Oct 2015 #5

    Maybe by posting his forums handle with the "at" sign, @Superfly can help
      My System SpecsSystem Spec


  6. Join Date : Jul 2015
    Posts : 2,595
    10 Pro
       09 Oct 2015 #6

    SunilKunwar said: View Post
    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.
      My System SpecsSystem Spec


  7. Join Date : Oct 2013
    A Finnish ex-pat in Germany
    Posts : 9,050
    Windows 10 Pro
       09 Oct 2015 #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.
      My System SpecsSystem Spec

  8.    09 Oct 2015 #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.)
      My System SpecsSystem Spec


  9. Join Date : Feb 2015
    Bamberg Germany
    Posts : 13,379
    Microsoft Windows 10 Pro 64-bit 14393 Multiprocessor Free
       09 Oct 2015 #9

    Thanks for showing up Craig
      My System SpecsSystem Spec


  10. Join Date : Jul 2015
    Posts : 6,332
    Windows 10 Pro
       09 Oct 2015 #10

    Kari said: View Post
    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.
      My System SpecsSystem Spec


 
Page 1 of 8 123 ... LastLast


Similar Threads
Thread Forum
Solved Product Key (Win 7) not accepted when upgrading to 10
I started the upgrade from Win 7 Home Premium to 10. I entered the product key, but get the message "Product Key didn't work". I have repeated this several times - I have the original disk & label, checked the key is correct via Belarc Advisor, have...
Installation and Setup
Solved Upgrading from 7 Pro using Techbench ISO - Product Key Required
Hi, I'm trying to upgrade a desktop Windows 7 Pro 64bit OEM, activated SP1, to Windows 10. I will have several machines to upgrade, and my fairly slow connection is capped except for overnight downloads, so I've downloaded the 64bit Techbench...
Installation and Setup
Upgrading Home install to Pro with generic product key
I'm curious, I might have to try this on an extra partition... My computer is fully activated on Pro version. I've also done a clean install after the upgrade and activated immediately just fine. So, let's say I bungled and clean installed...
Windows Updates and Activation
Solved Using Win7 product key after upgrading to Win10?
I'm wondering, if after upgrading a PC to windows 10, can I use the old Windows 7 product key to install windows 7 on another PC?
Installation and Setup
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 12:39.
Find Us
Twitter Facebook Google+



Windows 10 Forums