F2-F12 keys not working

I've got a Microsoft Natural Ergonomic Keyboard 4000 v1.0 and am running Vista 64 on my system. In game the F2-F12 keys are mapped to other keys, ie: when I press F2 the game thinks I'm pressing Z. This basically makes these keys useless, and I'd like to be using them to switch up my equipped weapons etc...

Has anyone else had this problem, and if so what did you have to do to fix it?

Thanks in advance!

Are you sure there's no F-key? My keyboard has an F-key to switch between normal F-functions and special shortcut functions.

Brilliant! Thanks Dark Kal. I now see that there is an F-lock on the keyboard. Amazingly, upon pressing this button, these keys work as they should in game. These new fangaled keyboards have so many extra keys on them.... ;-)

I know what you mean, my keyboard has several usefull shortcut-keys I never use because I don't expect them to be there.