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No, just change the email address in your Xbox live account.
press RT twice, and hold then turn off your xbox
yes and it is free
U have to contact xbox live support
No, rebooting does not delete your files.
no, your online rank will only be deleted if you delete your xbox live/psn account.
Well, you can delete your Xbox Live profile off your Xbox, but it is not possible to delete the Gamertag that you registered with Xbox Live. In the Account Management area, you can remove your credit card if you are using one, but you cannot take away the Gold Membership associated with your account (if you have gold, that is) Source: (I have an Xbox 360)
You need to have a Netflix subscription, if you do try to delete the Netflix application from your Xbox 360 and then reinstall it again.
There can inly be 1 xbox live gold file per xbox
First, go to "My Xbox". Then, go to "System Settings". Then go to "Memory". Then select the items that you want to delete.
No, they would have to delete memory from your Xbox 360 to do erase memory.