Both your wifi cards support WPA encryption, that's good.
You will need to access the router control panel via a Web browser.
Do this from a computer that is connected to the router via wire, don't use a wireless client to do this.
1. open browser
2. type http://192.168.1.1
3. enter username and password:
Username: blank, don't type anything here
Those are the defaults. If cannot access using admin as a password then you'll need to reset the router using the reset button on the back. A pen works well for this. You'll see the router led's blinky-blink while it resets. After reset, login using the defaults above.
4. There will be a section for wireless setup and wireless security. Enable the wifi and use WPA TKIP security. You can also give a unique name (ESSID) to your wireless network. The default name is Linksys. Name it something like "getyourown" or "nolongerfree" if you want to have some fun w/ the neighbor!
Have a look at detailed instructions in the user manual available here: http://www.linksys.com/servlet/Satel...=0034939789B05