Group Policy

Dear Sir’s

I Have A problem With GP in Win2003 Server
The Default Domain Polciy is Working very good
any change in Default Domain Policy Affects My
clients Directly.
My Clients Machins Run With Windows XP Pro SP2

When I Made any othe policy it do not affect the clients I do many trails as :
1. I try to add new ou and put policy inside.
2. I try to add new policy without ou.
3. I put dns manually.

I try every thing but no way

Please help me