F Buttons (eg. F1, F2) have lost usual functions please help!

Bought my MacBook a few days ago and today I think I've done something inadvertently which has knocked all the shortcuts out of whack. For example, F1 has a sign on it to decrease the brightness on screen, F2 has one to increase, F3 I think is something to do with Expose and F4 has a dashboard thing on it, then F7 to F9 are various controls to fastforward/rewind things and F9,10 & 11 are sound related...however, none of these work now, they do different things and I don't know how to get them to go back to doing what I want. When I hold down the fn button they work but it's a pain because I can't turn my sound on and off otherwise, PLEASE help, I'm getting really frustrated!

Open System Preferences.
Select "Keyboard & Mouse".
Select "Keyboard".
Uncheck the box labeled "Use all F1, F2, etc. keys as standard function keys".
That should do it.

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