I realise that this will be too late for your issue, however for the benefit of others I will answer anyway...
The reason LabVIEW doesn't see the USB dongle is that it needs to be installed as a VISA device, not using the Windows dll drivers.
If you look in Help -> iNU Solutions -> ANT+ Toolkit Help -> ANT VISA Driver Help this links to a document that explains how to do this and the differences between the 2 drivers.
There will be an issue with Windows 10 as by default this does not allow the installation of unsigned drivers, however this can be temporarily disabled.
Hopefully this will answer the question for others.