Hi,
thankx for your reply, but the problem is that i followd point 1 to 3 and still have the 
problem, that i´m not able to run the program.  

I have Win XP and also tryed the compability modus, but that doesnt work neither.
Version 3.x is running correctly, but i´m not able to download the tracks from my
728 unit. 
Livetracking with Dr. Depth is possibly, but not downloading tracks or updating 
the software on the unit.
Greetings
Maik