One computer's mapped network drives randomly disconnect. Can anyone help?

[Crlaozwyn]

Here's the setup - a new Dell server running Windows 2000 server (basically just a file share/printer box), with 5 computers connected. These computers run everything from W2K to Windows XP. One of the computers running XP will randomly lose connectivity to the server (can't print or view mapped network drives), but not to the internet (the server doesn't assign IPs). Other machines can still connect while this one machine goes down. A simple restart allows the computer to reconnect, until it randomly stops working again in a few hours/days.

Not sure if it's related, but when I went to check the domain to make sure it was identical, XP told me that "Networking had not been installed." I checked in "Add/Remove Windows components" and all the networking drivers/devices are installed.