Many old laptops and desktop towers feature physical "Certificate of Authenticity" (COA) stickers with valid, unused Windows 7 product keys that can legally activate the installation.
The Risks and Realities of Chew-WGA 0.9 Windows 7 Patch Activator
For historical and research purposes, the process for using Chew-WGA was straightforward, often following these steps, though many users reported encountering system file errors and boot issues afterward (as detailed in the risks section below):