my son made himself the only administrator. how do i change this1 person needs an answerI do too

Cut off his allowance :). Seriously, at the risk of getting involved in a family dispute or fostering an alterior motive, go to Start then Control Panel then User Accounts and determine if another Administrator Account is available. Normally two Admin Accts are availble with XP. Use the Help guides(top left corner of User Accounts window)to assist you.