Hello Horst,  
What version of Adaxes are you currently using?  
To check that, do the following:
- Launch Adaxes Administration Console.
 
- Right-click your service.
 
- Click Properties in the context menu.

 
- Adaxes version is displayed on the General tab.

 
Also, could you specify whether you have 64-bit or 32-bit version installed?