Belkin F8T001uk v2 (Widcomm) Bluetooth USB Adapter Dongle Not Recognised by the Computer as a New USB Device

I have a Sony Desktop Computer PCV-RX1 with Win XP and SP2 from Microsoft Windows installed (but the dongle was not recognised before or after I installed it). I have no license problem.

I can install the drivers (Widcomm) and the ones from the CD (Belkin) without any problem. But my computer just won't recognised the USB Bluetooth Dongle. Whatever I do, when I plug it in after installing the drivers, it does not recognise a new USB Device.

I tried to Add a new Hardware, using the Widcomm drivers. I also tried with “I Have the Disk” and then point to the BIN folder of the Widcomm or Belkin Drivers on my hard drive (depending on which one I tried). Nothing makes the computer recognise the Bluetooth Device. Any idea?

Note: it works perfectly well with my portable computer which recognised it instantly.