ip release/renew

i have 5 computers at home one is my server with windows 2000 server running and i have internet sharing also. they are all joined with hub with dynamic IP addressing using workgroup everything is working fine except one computer. i can see other computers and they see me but i can`t goto internet and reason is i can`t get ip from server.
tried release and renew and still keep getting 0.0.0.0 and by the way i can`t get renew to work keep getting error message. computer is windows 2000 pro andjust been formatted and re-installed.
changed internet card and still no luck
any thoughts would be appreciated