You can try this:
Is better using netlogon to join to e-smith domain so you can log the domain as admin user with password and the pc with another user and password, this should be beter in order to prevent storage of admin password in the local pc registry, (what is a potential internal security problem)
this procedure allows write access (granted to admin user) to all files an dirs of the primary site from a win based pc
Hope it helps
Alejandro