Hi,
LabVIEW does not have generic USB support. The following knowledge article explains:
http://pong.ni.com/public.nsf/websearch/42B604435E3F9604862565E20043CD30?OpenDocument
You can probably find more information on USB on external sites, such as:
http://www.usb.org
http://www.usb.org/faq/
DiegoF