1st you need to check wither all xp client is added to the domain or (the Clint is properly blinded with ADS server.
2 nd things you need to check any policy is created in the server.
Note – please come back with proper error, and then we can give the solution fro you [problem
Thanks and Regards
Somashekhar C N
Masta_Ash make sure you are trying to log onto the domain and not the client.