Hello and welcome to FixYa;
connect to the buffalo router via an ethernet cable.. then.
click this link192.168.11.1
(if link isn't working, copy and paste 192.168.11.1 in a new tab in your browser)
Wireless Encryption (WEP/TKIP/AES)
TKIP or AES.
or you can
Hit Advanced button at top right of HOME page.
Wireless Config > 802.11g,
under Wireless Encryption choose TKIP or
you can input your WPA-PSK (Previously Shared Key)
KittyTech If you need further help, reach me via phone at https://www.6ya.com/expert/carolyn_427ff26936286336