I have a Sony Vaio laptop with Windows 7 64-bit. After the automatic installation of several updates for Windows 7, the Bluetooth feature is no longer working.
- Click on Start > in the search field type "bttray"
- Right-click> Properties > Compatibility.
- Run this program in compatibility mode for "Windows Vista"
- Repeat the operation for "BTStack Server"
Thanks to Cam for this tip.