How do I make my comp stop beeping when I press 3 ons?!?

I play lots of games on my computer. GTA being one of them. When I try to do a donut i need to press ws(to start the skidding) then a or d to pick the direction of the circle. but when i press the third key my computer beeps. which in turn the key does nothing. its not sticky keys and this keyboard is pretty old.