DNS issues

i have a network with an advanced server 2ooo, 2 clients a XP and a w2k pro. my w2k client logs without problem in the domain but the XP won’t and i keep having this DNS error message.on the xp client it said network path caanot be foud or sometimesDNS cannot be found!!!!!, i tried to demote the sever , change the name and the dmain name, change the name of that cxp machien no problem, any other machine tha \t i connect connects easily but that xp machine.what can i do?