Zzzz-OEM-zzzzzz-00400 i neeed ***********,from MS

SOURCE: my PRODUCT ID is 00426-OEM-8992662-00497. so

If this is an OEM version of Windows then it has no activation key as OEM versions are "Pre-Activated" via the BIOS when booting to the OEM media to install the operating system.
If you installed the OS without booting to the OEM media (Or installed OEM media on a system from a different manufacturer), it will prompt for activation and there is no OEM key to activate it (Catch 22)
If this is an OEM system (HP, Acer, Dell etc) and you have the OEM media, boot to the media and run a clean installation of Windows (Delete the existing NTFS partition then create a new NTFS partition) to resolve

SOURCE: need product key for windows

OEM product keys should be either: attached to the system, usually on one of the sides, or in the package your received when you bought the PC. If it is prompting saying your key is invalid, you need that specific key or it will never activate. If all you are getting is that it cannot activate, you should be able to attempt the automated phone activation (9 sets of 6 number combinations) and it should work - I've done that many times successfully.