Your image never came across in PM either. Your Sony laptop uses the Realtek Chipset for audio. Try downloading and installing the latest generic drivers which are newer than the ones on Sony's website.
If you are not sure if you have a 32/64-bit OS, just download the package with this name:
Vista, Windows7, Windows8 Driver (32/64bits) Driver only (Executable file)
When you run it, it will usually remove your current drivers, reboot your machine, then re-install the latest drivers. After 2 reboots, they should be up to date and you can try to use your headset again.