Hi,
Group Plicy has no option to prevent user change UserInfo.
I only find the registry entry to change UserInfo(UserInitials, UserName), it located to following path:
HKEY_CURRENT_USER\Software\Microsoft\Office\Common\UserInfo
The UserInfo is String Value, it seems cannot block.
As my test, if the new user login computer, and start Office program fist time, Office will prompt dialog box let user change UserInfo.
You can also check this thread, hope this helps:
http://social.technet.microsoft.com/Forums/en/winserverGP/thread/9fe60b17-d12b-48a3-9ca5-3f6e2bab8057
Best Regards.
William Zhou
TechNet Community Support
