I'm experiencing random operating system lockups. The only recovery so far is a system reboot. As the system begins to restart, the system "blue screens" and displays a system message of "MODE_EXECPTION_NOT_HANDLED" for the driver niVVGLK.sys.
The nivvglk.sys file is installed with the NI-VXI driver. Try reinstalling NI-VXI. If you are still having problems, the issue might be related to the OS, especially if you are seeing issues with other software. If the re-install doesn't fix the problem and you are not having problems with other software as well, please reply back with the OS version and NI-VXI version and I'll see if there are any conflicts.