Hurts right in the gut...
A WIDCOMM stack.. A 3rd party stack for BT receivers under Windows XP.
I was referring to the stack that Windows XP uses for Bluetooth receivers.
Windows wants to use it's own BT stack whenever a BT receiver is installed. Even though you load drivers from the Mfr, a lot of times XP loads it's drivers right back.
The issue is that the Windows BT stack does not have a headset profile. (not real smart)
The result: Your BT adapter will not "see" your headset.
The solution is covered here (I don't read anything with skype in the URL)

:
http://www.windowsdevcenter.com/pub/a/wind.../bluetooth.html