Alright here we go:
go here, direct download link for your wireless driver:
http://www.trigem.com/upload/AMERICA...0and%20lan.exe
its in exe format, so i would imagine just download it, double click and it should do the rest. Which it should uninstall the old one first.
But if you want a "fresh" driver install:
Go to your "Device Manager"
Locate your wireless lan, right click and go to uninstall.
Afterwards restart, then click on the .exe file to install your new drivers.
Restart again and you should be good to go.
heres the site for more drivers/info on your laptop:
http://www.trigem.com/us/support/drivers.asp
Make sure you download the file before you uninstall your wireless! In less you have another way to get internet to your computer? Usb cable or network cable