I'm trying to change the log in email of my XBL profile to a new one. The problem is that the new email I want to use has some randomly generated XBL profile assigned to it automatically. When I try to change my XBL profile log in email to the new email I want to use it tells me that the new email is linked to an account already. I tried to remove the randomly generated XBL profile from the email I want to use, but I'm afraid that it will completely close out the entire account instead of just the XBL profile, which will make me lose all of my important emails, etc.
Any help would be greatly appreciated.
EDIT: This account that I'm using right now has the email I want to use, but my gamertag is the randomly generated one.