I would expect that unless you did a reinstall or upgrade the drivers should already be there.
Insure that your wireless is turned on mechanical switch flipped to on, and FN + F8. Then look in the system tray for available networks and select one, enter the security key.
If for some reason your network does not show up, go into the network control panel, manage wireless networks, delete your network, and restart your computer, which should allow it to re-detect the signal -- but be sure that the wireless is turned on first.