Dell Windows 7 Pro OEM activates using OEM System Locked Preinstallation. Use the Dell Windows 7 Professional Reinstallation ISO for this.
If you previously had Windows 10 Pro installed and activated on your system then it is already registered with a Microsoft Product Activation server. You can install Windows 10 Pro without a key and it'll automatically reactivate when online.
If you have never installed Windows 10 Pro, then you'll need to perform an Upgrade Install or use GatherOSState on the Windows 7 Pro OEM.
JOcean
9 Legend
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12.6K Posts
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November 21st, 2018 15:00
A lot of information on the following forum post.
https://www.dell.com/community/Desktops-General-Read-Only/How-to-retrieve-Windows7-act-code-based-on-Dell-service-tag/td-p/4257494
Philip_Yip
9 Legend
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16.1K Posts
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November 24th, 2018 08:00
You don't need your Product Key...
See here for more details:
https://dellwindowsreinstallationguide.com/windows-oem-faqs-and-downloads/
https://dellwindowsreinstallationguide.com/oem-activation-mechanisms-and-oem-downgrade-rights/
speedstep
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47K Posts
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November 27th, 2018 08:00
The SLP key cannot be used to activate with non OEM media.
There is no recovery of the paper key.