Joyning xp pro to sbs 2003 problem

I have got pc running wp pro and server sbs2003 my dns works fine (nslookup gives the ip) but when im trying to connect the pc to the domine with network id wizard in autorisation stem it gives me an error: Multiple connectionc to the server or shared resource by the same user, using more than one user name, are not allowed. Disconnect all previous connections to the serner or shared resource and try again.
Please help.