Additional Information
If the above steps don't work, or if you run into Error 1053 when attempting to restart the NI Device Loader Service, then you might want to try a more thorough uninstallation process before reinstalling NI-DAQmx. To do so, please try the following additional steps found in this article: Perform a Clean Uninstall of NI Software on Windows.
As a last resort, you might need to reimage the PC to start from a clean installation.