There are some cool free ware programs that you can setup to run as a server:

Note: I've tested them all under Firefox Browser as they will work with IE 6, 7. for the past 6-7 months now.

Web Server
KF Sever this is found on the KeyFocus web site has one of the easiest to install and configure plus you can access all your documents, media, pictures, audio from this server also

Mail Server
DeskNow easy to installed and configure, the best part you can try out the full pro for 28 days then after that it converts to a free ware version. Still not a bad program for free.

Music Server
Vibe Streamer is another good example if you want to stream all you audio files to any PC using the web browser. Again this is 100% free ware and works very well easy to setup and use.

Note; All the programs here will work with XP Workstation and does work on Server also. KeyFocus one you can also play videos too using VLC media player (optional) that one is also free as well.