DOS boxes in Windows 7

Hello list,

I have a project with a web based application, distributed
on a USB-stick. The basic configuration I got from light2go.

It works nicely from Windows 2000 through Vista.

But on Windows 7 I get a console-window ("DOS box") with 
every request. It appears and vanishes quickly, but it is
annoying nevertheless.

I tried some tricks with "start as administrator" and "start
in compatibility mode", but nothing helps.

Do you have any hint for me?

Thanks in advance

Emil