Everytime I have played this game I get to a part where the moon is getting attacked. Anyways, when I try to defend it by launching my fighter ships the game closes and says an error message about a illegal operation and the program must be terminated(closed). I love playing this game so please can someone one tell me how to fix this problem?

Are you using DosBox?

The exact error message?
Your Operating system?

Always post as much data as you can when asking for help, never to much!