he might want to check this site
http://www.voyager.bt.com/205/prodinfo.htm
and see if he can gett he default pass/configuration to see if he can make the games work. it is highly likely his isp changed the default password, but there may be a way for him to reset eveything to default and get in.... though this may make the dsl router no longer work without the isp's specific settings in there. he can always say "i have no idea what happened, we lost power to the house one day, and when it came back on, i couldn't get internet!"
i mean, those things happen