BridgeVIEW 2.1 is equal to LabVIEW 5.1 - and there was not 'native' USB driver support.
Even the latest LabVIEW 6.1 with the LabVIEW Datalogging & Supervisory Module 6.1 has this limitation.
Check it out:
Can I Use Third-Party USB or IEEE 1394 (FireWire) Devices with LabVIEW?
Hope this helps
Roland