Unable to start the bluetooth stack service

Hi all,
I am using dell notebook (Inspiron) with windows 7- SP1, 64 bit for the last six months.
I installed the IVT Bluesoleil version 8.0 on this NB, for the blue tooth use, and it was working fine.
However, due to the evaluation version, I had to uninstall it, and revert back to the original BT drivers ( Dell wireless 365 Bluetooth module, etc).
Now after very restart I am receiving an error
“BTTray
ERROR: Unable to start the Bluetooth stack service"

I had searched the net for any solution, and the common actions advised on multiple SITES has been
Performed by me like:
1. Update the drivers
2. Re-Install the drivers
3. Uncheck the BT from start menu
But the error is still popping up
Is this issue faced by anybody else?
Hilse
