I'm not sure if this should help or not.
Uninstall BT module, turn the BT module OFF after uninstallation. Dont forget to get rid of all BT devices before this though. Don't reboot yet, uninstall the setpoint too here.
Reboot, run the 350 module driver, it should tell you to turn the module with pop up sayng "turn on BT by Fn + F2 key", let it install. Install setpoint.
Reboot, install the devices by connecting them.
If this doesn't help you, I don't know what to tell you lol.
BTW, do you HAVE TO install the BT driver by Dell? I recall(I think) Vista pretty much installed the driver by itself when I fresh installed. Oh, and I'm still using setpoint bets since it's been working well, and I'm not going to try to fix something that ain't broke lol.