hi,

when i play the game, the DOS Frame minimizes often. Then I click on the Icon in the Bottom Line and I can continue playing, but 20 secs later it minimizes again.

help!!! :wallbash:

It seems you are trying to run the game in plain Windows. I strongly suggest you use DosBox instead.
You can download it here.

You might want to check out the official DosBox FAQ, and particularly this part of it. It is quite helpful for users unfamiliar with DosBox.