Help, my computer's F keys do weird stuff

[nonconformist]

Really randomly, halfway through a computer game, my computer has decided to, whenever I press an F-key, to do something weird.
I have nmo idea if I've somehow binded everything or if there's a short-circuit in my keyboard, but so far this is what I can tell is happening:

F3 mutes
F9 opend Firefox
F10 opens Outlook.

Please help!

Cheers.

 

[Zelig]

Push the F lock button.

 

[nonconformist]

Okay, the problem's solved.
Thanks