The Asus EEEPC supports WPA and WEP security for Wifi. If you want to you WPA2 then you have a problem, or not?

The eeePc is a Debian derivative. You can connect the lan cable and enable the cable connection. Open the File Manager, then clicked on menu Extra --> Open console window

The shell will appear a you will see the shell prompt.
Type the following command in the command window:

/home/user> sudo apt-get update
/home/user> sudo apt-get dist-upgrade

This time the program prints the list of the packages that will be updated, and in the list there are many core packages, including atheros wireless. Enter 'yes' to let it proceed with the upgrade.