not enough server storage space

I have loaded two different pc with windows nt4.0 .with no problems them service pack 5 and still no errors .as soon as i load the networking portion and reboot at the login i all ways get a error message not enough server storage space available. what am i doing wrong or how do i fix this problem. after i hit ok everything seems ok. i use tcp/ip dhcp for networking .i have about 100 computers already on the network.