I too can now use Desktop Manager through BT, but what an ordeal! I caused the problems myself buying a BT USB adapter that was not on the Microsoft approved devices list - Kensington. Finally searched here and found that I needed to uninstall the supplied Widcomm drivers and manually patch the Kensington adapter info into BTH.INF. It was smooth sailing after that.
I guess the lesson in this is to know ahead of time that the USB adapter and its supplied drivers you plan to use play nice with your OS (XP SP2 in my case).
Sure thankful for this forum and the knowledgeable folks here!