Hello k0rny,
In the past, Microsoft used to store Windows Registration Information directly linked with the Product Key that the registration was submitted for. Unfortunately, due to Privacy laws and legal action, Microsoft is no longer able to store the Windows Owner's Personal Identifing Information directly linked to the Product Key for that Windows. Therefore, we no longer have any records as to what Product Key belongs to what user.
Thank you,
Darin Smith
WGA Forum Manager