You probly need to set up an admin or a specific client connection. The server has these things installed automaticly but you need to turn them on or activate them in the IIS manager. I had a similer problem when I set up 2003 server enterprise. The documents I wanted to be seen on my website were only showing up as a page with files and I found that I had to add my active directory to to either :Enable default content page" or Enable document folder for it to be viewed in my web browser as a web page. (right click the site you are wanting to see click properties click the documents tab and thats where you add want content you want viewed). Also make sure you have your subnet mask and such set the same on the client and the server. I looked most of this stuff up myself via windows server for dummies e-book. This is a website I designed just to learn how to write HTML and such useing Adobe Dreamweaver.
www.highoptional.dyndns.org

Give your server (Win 2003) IP address in client (Win XP) pc default gateway to do go to network Neig--> Properties---> TCP/IP--->Properties---> add iP in default gateway.

I have a 2003 server pc and 5 xp professional pcs. see i want to connect these systems in internet lan connection.then i must need one administrator pc and 5 clients pcs.if i connect these pcs administrator and clients versions.please give me the advice and how can i connect these systems.i want to 1 administrator and 5 users enterally these systems how.