Dell Inspiron WLAN card not working...?

I recently reinstalled my operating system on my Dell Inspiron 1525 because of cluttered drives. I deleted everything, and now my wireless internet does not work. I HAVE ALL THE DRIVERS, AND MY ROUTER WORKS FINE ON ALL OTHER DEVICES. The light will not go on when I turn the switch to the on position, and I dont have any "F" keys for it. Please help....it says I have the drivers installed, but there was a problem with the card using them...theyre the real drivers straight from Dell.