IBook can't connect!

My old iBook has OS 10.4 - 700 MHz Power PC G3. I have the AirPort card 9.52. Why can't I get on the internet. All our other computer connect but not this one. We have WAP2 security on the main computer. Somewhere I read that might be the problem. We have a Netgear Wireless Router WNR2000
if that helps. Our main computer is a PC not a Mac but I have two other Mac that will connect, a G5 and a new MacBook Pro. Please someone help me.