The Win2K Server exam: Your first list t

i have a modem attached to a win 2k prof pc
i have several pcs connecter to it in a small lan.
i share internet connection . all pcs are running win 2k prof.
connection is slow even i use the dlink hub
i have a dlink server dp602 i used to use with win98 .Can i use to improve the speed of the network and how ? e mail me metrocyber@yahoo.com