Unable to determine the install root path for the LabVIEW Runtime Engine

Hi,
i have an issue with using a LabVIEW interop assembly in a .NET application. I get an exception "Unable to determine the install root path for the LabVIEW Runtime Engine" when calling the assembly.
The little test program is attached below. It's called dotNETHost.exe. If you excecute the programm a dialog with an button appears. Clicking the button shall open another dialog (the LabVIEW Interop component). But the only thing I get is the exception message. The ZIP folder also contains the complete exception meassage (ExceptionMessange.jpg & ExceptionDetails.txt).
The Interop Assembly was built with LabVIEW 2011. We use Visual Studio 2010 and .NET 4.0.. The dotNETHost.exe.config file is prepared as mentioned in Knowledge base - Loading .NET 4.0 assemblies.
The Interop assembly contains only one simple dialog (loop is finished by clicking OK) without calling any other VIs or other DLL's.  In case of this there's also no support directory generated by the build process.
I have no idea why it doesn' work. I hope anyone can help me.
Thanks in advance
Kay
Attachments:
Debug.zip ‏75 KB

This may be unrelated, but Labview and .Net4.0 dont work well together. Not yet anyway. I had to compile my assembly in 3.5 to get it to work.
Please read the following:
http://zone.ni.com/reference/en-XX/help/371361H-01/lvhowto/configuring_clr_version/
http://digital.ni.com/public.nsf/allkb/32B0BA28A72AA87D8625782600737DE9
http://digital.ni.com/public.nsf/allkb/2030D78CFB2F0ADA86257718006362A3?OpenDocument
Beginner? Try LabVIEW Basics
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