We should be able to use OleView to see if the DLL is registered on your system. However, I'm wondering if this is a dead-end. The whole reason we pursued this angle is because you were receiving a DLL load error after DIAdem crashed.
Previously you said:
"Sometimes it helps to delete some tasks from the task-manager (nisvcloc.exe, nidmsrv.exe,nicitdl5.exe, nimxs.exe, nipalsm.exe, lkads.exe, lkcitds.exe, lktsrv.exe, nvsvc32.exe), but the last time it didn´t succeed and DIAdem stalls at "Lade: \ADDINFO\GFSODBC.DLL". After I started and ended DIAdem 8 I´m again able to start DIAdem 9.1"
We have already determined that loading DIAdem 8 does not allow you to load DIAdem 9.1 every time. Does the "Lade" (I assume that is load) error occur every time? If not, what other error messages do you receive.
Also, we never worked out a guaranteed fix - do you have to restart your computer?
Finally, we determined that this issue was a CAR but could be avoided if you simply opened DIAdem before you ran your test. Can you add code to make sure that DIAdem is loaded before you call the LabVIEW test? I would assume that this could also help resolve your issue.