dns pointing

dear friends,

i facing one problem with dns is pointing to different ip other than i want how do i change to this previos or other ip.
actully what happen is our win nt 4.0server runing dns and web server and other services last weak i tried to change this to linux server and we assagined different ip to that from that time its pointing to that ip.now i want to put back my old server,what i have to do, i am in uae.please help me to to solve this problem.please explain
thanks hrishi