Hi,
Yes, I have been noticed about such problem in Visual Studio 2008 (even in full). Unfortunatly do not know why it happens. On some PCs it works without any problem on others it shows such warnings and does not allow to change demo. Will try to fix it. Unfortunatly it works perfect on my side and I need some time to reproduce the problem.
However, it does not appear if you create new your own project.
Error 4 means WCL_E_FEATURE_NOT_SUPPORTED. It just indicates that you Bluetooth driver does not support such features as reading Connectable/Discoverable states (it is possible with MS, Toshiba and latest BlueSoleil, changing those states possible with MS and latest BlueSoleil only). However, it is not so important thing. This properties (Connectable and Discoverable) shows (and manages when set) the state of your local dongle.
Connectable - if True dongle (local, cannected to PC) accepts incomming connections
Discoverable - If True dongle (local one) is visible to other devices.
If connectable == True and Discoverable == False - a remote device can connect to your PC only if it knows your PC's MAC.
If connectable == True and Discoverable == True - a remote device can find and connect to your PC
if connectable == False and Discoverable == False - a remote device can't connect and can't find your PC
if Connectable == False and Discoverable == True - invalid state