Start->run->regedit
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT(or windows)\CurrentVersion\RegisteredOwner
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT(or windows)\CurrentVersion\ProductId
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT(or windows)\CurrentVersion\RegisteredOwner
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT(or windows)\CurrentVersion\ProductId