Bluetooth Headset Free - BLUETOOTH PAIRED - BUT HEADSET FREE SERVICE NOT INSTALLED

I have a headset bluetooth, it is paired, connected and I can enable Headsetfree service on the device from the host PC (Win7 home).

The Headset free device is not installed (it fail), I suspect that the problem is on c:\Windows\inf files, because i get a problem for the USB device and I have fix it replacing the files usb.inf and usb.pnf.

I have tried to replace the files bth.inf, bth.pnf, etc but the problem remains..

Which is the file that manage the handset free service? If you have an handset free is possible to see it on properties of device on detail cart.