I migrated from T61p (XP) to W510 (W7). First, all of my Bluetooth devices worked fine under T61p. On W510 thinkpad, at first, it paired with my stereo headset SONY DR-BT50 as a mono headset but none of applications can see my headset. I upgraded it with "Bluetooth with Enhanced Data Rate Software II for Windows 7". Now my applications can see it as a mono bluetooth headset. But the program such as Window Multimidia Player won't see that I have a stereo bluetooth headphone and all the sound going through built-in speaker. Does anybody know how to fix this problem? Thank you.