If you entered the wrong registration information when you installed Windows you can change it and other miscellaneous settings such as ProductID and ProductName.

Open your registry and find the key below for your operating system.

Windows 95, 98 and Me:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion]

Windows NT, 2000 and XP:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion]

Modify the strings values of 'RegisteredOwner' and 'RegisteredOrganization' to equal the required owner and company names.

Settings:
Name: RegisteredOwner, RegisteredOrganization
Type: REG_SZ (String Value)