KXRPC runs as a service on the account logon domain controllers. It is used to assist Win9x clients get some additional info such as @Fullname. It will not help you get any information about OU's. For that you will need an Active Directory aware client. If you have AD aware clients, there are some UDF's in hte library to assist you with OU's.
If @PRIMARYGROUP is empty, insure that the KXRPC serive is indeed installed and running properly on your logon servers. Insure that all the binaries are copied to %windir% (it's in the path so Kix32 can find them easily).
