Consider using your own XP logon. In the Control Panel (depending on what "view" is used), User Accounts can be used to create a new account just for you.
Bob
Novice user.Keep trying to download but every time download compleats I get my teenage stepsons information i.e his address book,his messages ect.and if I try to alter the settings(deleat his info and put my info in,which doesn't work,his info just comes back after closing and re-opening messenger) he gets"upset" because it alters the settings on his Apple computer
How can I download messenger and input my settings without getting his settings?

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