Some Function Keys are not working.

Hi,

After a reinstall of Windows 7, I've noticed some function keys are not working as they should.

I first noticed the F3 key for enable/disable touchpad wasn't working but I solved that by uninstalling and reinstalling the Alps Touchpad drivers.

The keys that still aren't working are:-

F8 - Rewind

F9 - Play / Pause

F10 - Fast Forward

and also the key next to F12 for Mute.

All other keys are working correctly. I've installed the latest Quickset drivers. I ensured that all drivers were installed in the correct order when I reinstalled the OS.

Any help appreciated.