Generally speaking Jazz Jackrabbit wont work with Dosbox at all but i have made a tutorial on dosgames.com forums explaining how to get it working in XP but i will explain it here.. http://www.dosgames.com/forum/viewtopic.php?t=4555 is the topic. (I am not advertising anything here!)

1) Get TPPATCH.exe from somewhere. Google is your best option.
2) Also get VDMsound and launchpad
3) Put tppatch into the Jazz directory
4) in dosprompt navigate to the jazz directory and type tppatch jazz.exe
5) That should have rid of the Runtime error for good it is now playable without sound or MAY work in dosbox, Check with current releases.
6) if not then use VDMsound and SET IT so that the SOUND is the same as jazz jackrabbits config sound. Then it should play nicely

I hope this helped some people