Connected to the Network, but not the Internet

I have a 13" MacBook Pro and it is not connecting to the internet! Airport says im connected to my internet connection, but safari won't load the internet. I tried Firefox and still, the same result. I resetted the modem and the router, but still nothing. The internet connection on my other computer works fine. So I got on the Windows partition and it connects to the internet! So it's just OSX that won't let me connect cause my Windows partition works fine.

So how do I fix this?

Thanks in advance.

So I restarted my computer for like the 6th time and for some reason, when it loaded on the Apple Screen, there was a gray bar underneath. After it filled up, a blue screen popped up. I waited and waited for about 5 minutes and I was getting impatient, so I pressed the power button to turn off the computer. I restarted again, the gray bar was still there loading, and this time, i was only on the blue screen for about 30 seconds and my wonderful desktop loaded!

Miraculously, the Internet worked again! I didn't even do or change any of my settings or anything.

Anyone know whats going on?