niswitch_64.dll not found

Hi All,

 I have just purchased a PXI chasis with a PXI-2530B switch card, and a PXIe-8360 ingterface card. This is connected to a windows 7 64 bit pc running VB6.0

I have used NIswitch soft panel and that appears to work and communicate with the PXI systemm ok. However when i run any of the VB6.0 examples it reports a file not found NISwitch_64.dll - the reference exists in the project and the object browser shows all the function and variables available within NISwitch_64.dll but the program will not run. and the file exists where expected. 

Out of desperation i have tried placing the dll in the syswow64 folder and the system32 folder to see if it is a path issue, no joy.

Does anyone have any suggestions ?

Thanks

Justin