Fn + F5 key does not pop-up wireless enable/disable window

[kramkrish]

I have a Lenovo IdeaPad Y530. I have windows xp pro on it. I have a problem with the Fn + F5 key which is used to enable/disable wireless and bluetooth. When I installed the drivers the first time, everything worked fine. I switched off the bluetooth because I wasnt using it much. After a few days, the Fn + F5 key does not bring up the pop-up window where you get the option of enabling/disabling wireless and bluetooth. For that matter, there is no graphic/window displayed when I use any of the function combo keys (for example, volume increase/decrease, brightness increase/decrease) - but they all respond properly i.e. when i use them they reduce or increase the volume or brightness (without displaying the graphic). But, for enabling bluetooth, i need to see the pop window so that I can click on the enable button. I tried re-installing the hotkey drivers but still no use. I do not know how to enable bluetooth without the Fn + F5 key working? Is there any other means of enabling the bluetooth functionality other than using Fn + F5 key?