How do I set up a Linksys Instant Wireless Network PC card (WPC11) with Windows 98SE, ME, or 2000?

Double-click the Linksys Monitor icon in your system tray.

Click on the Site Survey tab at the top of the WLAN Monitor window.
Select your SSID from the list, and click on Connect button.

Select your WEP level from the drop-down list and then enter your Passphrase or WEP Key in the space provided. Click on OK.

You will return to the Link Information screen and you should now be connected to your Comcast Wireless Gateway.