Need some help for my 2nd hand SONY PCG-C1MZX which have integrate BT

I installed the clear WinXP and SP2, then install the newest BT driver which from SONY website.

but the problem is I could not find the MS stack on Control panel.. in Device Manager there is no Bluetooth Radios

and the driver I just installed could be found in Network adapters which is OPEN INTERFACE Bluetooth Network Adapter.

Can someone plz tell me if I did something on istalling the driver?

cheers