big problem with unc path in win server 2003

in having big trouble with my windows server 2003, i cannot ping any hoston my
network and also any host cannot ping the server, first i cannot ping 127.0.0.1
and also \\server ip dosent work, so i desactivate wins but it gives me now
the ping problem , my server seems to see itself and no one else in the network
pls could anyone help