[Start] [Run] [Regedit]
Registry Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
Modify/Create the Value Data Type(s) and Value Name(s) as detailed below.
Data Type: String Value // Value Name: RegisteredOrganization
Data Type: String Value // Value Name: RegisteredOwner
Setting for Value Data: [Modify the Values to Reflect Current Information]
Exit Registry and Reboot

http://www.theeldergeek.com/modify_registered_owner_and_organization.htm