I understand how annoying it is, but you must go and look for unofficial patches for fixing your server.
Try to close all ports, leave only whats needed for Jedi Academy Server.
Keep an eye on your console directly from the server.
Enable WinXP Firewall and patch your WinXP from Windows Update.
Use virus scanner, but not a heavy one. I use free-av.com ( freeware & doesnt detect spyware and adware, but it detects rest).