Could you tell me more about your setup? Has it worked before? If so, what has changed? If this is a new setup, have you looked for example code to work from? The latest versions of NI-VXI ship with several C examples, but I'm not sure about the older versions. Have you tried simplifying your code to verify that NI-VXI has been installed successfully? Just a few questions, but hopefully they help us get this working.
Logan S.