(adsbygoogle = window.adsbygoogle || []).push({}); im looking at buying a xbl account.
but after i have bought it, is there a way to make it completely secure so he cant recover it back?

change the email and password

Like he said, change the email and password, but you also need should change the secret question and ask for the DOB.

go to live.com and change everything in the account settings

change email and password although he may get a notification on his email that you've changed it