you are using high security level WPA-PSK is similar to TKIP (i think). when i tried TKIP which is higher then WEP and same problem it was gray outed. so i used WEP which is lower level security and it worked.
as of you laptop working fine ebcasue it supports that level of wireless security.
wii does not support high level of wireless security so try to reduce youe security level one down if not two down. same thing for ds if you have one.
i use WEP
sorry for my bad English. i am not English from india