I have set up WIndows 2003 Enterprise edition with xp pro sp2 clients. When they login in the morning they can see printers and shared folders fine. After perhaps, 10-30 minutes, the printers are no longer accessible. Sometimes you can't see them at all, or they just won't print unless they log out and log in again. If they browse in My Network Places to the server, it may tell them this resource is unavailable or another logon box pop appears to enter a username/password to gain access into the server (or any other PC in fact). If you enter the administrator and password, bingo, you're back on the network for 10 mins or so. Help, because I can't tell the users the admin password! We use a netgear switch.