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These keys were originally tied to specific hardware (like a Dell or HP laptop). Under Microsoft's terms, they are not transferable to new machines.

Most Windows 7 keys found on public forums or gist repositories are not authorized for general use. They typically fall into three categories: Windows-7-Product-key-2015-for-Windows-Pro---ultimate-free

Most public keys are blocked by Microsoft once they are detected on multiple unauthorized systems. These keys were originally tied to specific hardware

Websites offering "free" keys often bundle them with "activator" tools (like KMS Pico). These tools frequently contain malware, keyloggers, or backdoors that can steal your data or passwords. Windows-7-Product-key-2015-for-Windows-Pro---ultimate-free

Regardless of the key used, Windows 7 is no longer a safe operating system for daily use.