See if this helps: -Go to router's default page (it's 192.168.2.1 on my machine) -Log in with your password, if you had set up one earlier -Go to 'Security', and change the security mode to 64bit WEP (I'm assuming you had 128bit WEP before, else do the other way 'round) -If neither of 'em works, try WPA2 ... makes life easier (If you're running an older version of MAC on any of the machines in the LAN, there's no way out, other than simply letting it flow unsecured; which is the situation I am at. -Setup a WPA2 passphrase -- Hit 'Apply Changes' .. you should be good to go!!!