The presence of "OEM" in your Product ID ( 00426-OEM-9141204-13000 ) provides two major clues about your system:

Websites offering "free master keys" or activation crack tools (like KMSPico or loaders) often bundle malware, spyware, or ransomware that can compromise your personal data. How to Find Your True Windows 7 Ultimate Product Key

Can you locate a anywhere on your PC chassis? Share public link

If your system shows this Product ID, it means the computer originally came with a license. To activate it, you need the original 25-character key.

Used to cryptographically prove ownership and activate the OS. How to Find Your True Windows 7 Product Key