Hey Matt
Ok, the game needs to be run in a DOS environment. Have you tried restarting Win98 in DOS mode?
About DOSBox: First of all it's a resource hungry program, so unless you got a pretty decent machine, I won't recommend it. Anything less than say, 1.2 GHz and plenty of ram will most likely cause DOSBox to fail working properly, especially if the game is big too.
If you do have a powerful machine, feel free to read the DOSBox tutorial (link in my signature) and then post in troubleshooting after you have searched that section for answers to your problems setting up and running DOSBox.