Windows Key Sticker Got Damaged

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

You don't need your Product Key...

• 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.

See here for more details:

https://dellwindowsreinstallationguide.com/windows-oem-faqs-and-downloads/

https://dellwindowsreinstallationguide.com/oem-activation-mechanisms-and-oem-downgrade-rights/

The SLP key cannot be used to activate with non OEM media.

There is no recovery of the paper key.