Bluetooth connection problem

Here's a strange problem I recently discovered.  I occasionally use my cell phone as a Bluetooth connected modem.  However, the last time I tried it, it wasn't connected.  I checked the Modem selected for the connected, and it had reverted the modem to the 56k, showing my Bluetooth modem as not connected.  I checked the Bluetooth devices under Control Panel and it's showing no devices.  Strangely, the Hardware tab is also showing no devices.  Thus, when I try to add a new Bluetooth device on the Devices tab, it can't find any devices.  Where it gets really strange is that the Device Manager does show my DELL Bluetooth Device as "working properly".  Any ideas?  Thanks.