Hi,
I think that as a first step you should make sure that your BlueTooth device is fitting in the requirements listed on the following web-based document:
http://zone.ni.com/devzone/conceptd.nsf/webmain/5EB9312A6470F16A86256E7500726F15?opendocument
Here it says that the device should be using the Microsoft bluetooth driver in order to be driven directly by labview.
I hope that the information reported on this document can help you in solving your problem
Regards,
AlessioD
National Instruments