I have installed windows server 2003 r2.I put it in domain... it shows a domin when I right click on my computer and look in properties... I request it to create a user in ad and then I tried to login as that ad user theni am able to get log in but when I decided to give this ad user,administrative right on that local PC.. For that I needed to login as local administrator on that domain but the problem is that I am unable to login as local administrator on that domain... Please help

First cheek you domain configuration