Using Linked Server To Query Active Directory From SQL??

I want to create a view in SQL populated with users from our Active Directory. I have learnt that this can be done using linked server. I have tried using the following:





sp_addlinkedserver 'ADSI', 'Active Directory Services 2.5', 'ADSDSOObject', 'adsdatasource'


go





sp_addlinkedsrvlogin @rmtsrvname = 'ADSI', @useself = 'false', @locallogin = 'sa', @rmtuser = 'lok_applications', @rmtpassword = '9dfFfG374GoiAo6yxxc8oZ'





SELECT *


FROM OpenQuery( ADSI,


'SELECT * FROM "LDAP://194.22.1.18/DC=lok,DC=net"')





I keep getting this error no matter what I try:


An error occurred while preparing a query for execution against OLE DB provider 'ADSDSOObject'.


OLE DB error trace [OLE/DB Provider 'ADSDSOObject' ICommandPrepare::Prepare returned 0x80040e14].





Any ideas why??