network operating system

need more info as; How many pc's on the network??
5, 50, 500 or more???

I usually recommend the use of fast ethernet using 100 mpbs on Cat5e cabling and a switch, or switches, suitable for the number of PCs in the network. Further than that requires more info re numbers and sub-net requirements. This allows for expansion to 1000 mbps later but lets you start with cheaper hardware. Dont use hubs for anything more than 5 PCs, switches are so much more effective.

Windows Server 2003 is very user friendly.