Device Manager > Bluetooth Radios

* Microsoft Bluetooth Enumerator
Driver Provider: Microsoft
Driver date: 6/21/2006
Driver Version: 6.1.7601.17889

*Thinkpad Bluetooth with Enhanced Data Rate
Driver Provider: Broadcom
Driver Date: 4/8/2010
Driver Version: 6.3.5.430

If you get this sorted out, I'd like to be able to also access the N900 for mass storage via bluetooth as you are doing.