First of all u need a good connection to host games
Second u need a good server cfg files --> drt.excessiveplus.net download section, when u download the archive extract it to q3 folder and run the batch file called xp_dedicated.bat, it may be named different, and ur server is upp,

Also You could try this
http://forums.excessiveplus.net/viewtopic.php?t=1004

Or if u realy have such big problems PM me.....