disable bluetooth Secure Simple Pairing (ssp)

Hi,

I have an old Bluetooth headset (Z-W88), which cannot be paired in Windows 7 - it shows a code and it asks me to compare it to the one on the headset. No matter how I respond to the question (yes or no), the pairing fails.
I figured it out that my headset does not implement / miss-implement other authentication than PIN authentication.
In Windows XP, which does not provide support for Bluetooth 2.1+EDR and Secure Simple Pairing, I was able to use the headset without any problem.

In Ubuntu 12.04, initially I had the same authentication problem. But after I executed the command "hciconfig hci0 sspmode 0", I was able to connect the headset.
My question is how can I do the same thing in Windows? How can I disable the Secure Simple Pairing Mode? I couldn't find any option in the Bluetooth settings. I searched in the registry, but still nothing. I wrote a C++ program in which, in the Bluetooth authentication callback, I set/force the authMethod member of the BLUETOOTH_AUTHENTICATE_RESPONSE structure to BLUETOOTH_AUTHENTICATION_METHOD_LEGACY and pass it to BluetoothSendAuthenticationResponseEx function. Still nothing.

Thanks for your help.