Use strong encryption

Because of WEP's weaknesses, you should use the Wi-Fi Protected Access (WPA) protocol instead of WEP if possible. To use WPA, your WAP must support it (you may be able to add support to an older WAP with a firmware upgrade); your wireless network access cards (NICs) must support it (again, a firmware update may be necessary); and your wireless client software must support it. Windows XP Service Pack 2 installs the WPA client. SP1 machines can be updated to support WPA by installing the Windows WPA client with the Wireless Update Rollup Package — see this page for more details. Another encryption option is to use IPsec, if your wireless router supports it.