How can I remove an iTunes account from a computer I'm giving away?

Question

How do I remove my iTunes account from a computer that I am giving to a student in my school? I want the music I purchased to play, but I don't want the student to have access to my email address or my credit card that is tied to "my account". I went through the steps to deauthorize a computer but encountered two problems:  1) The only command offered was "deauthorize all". There was no list of the authorized computers where I could check a box to select the one to deauthorize.  2) If I want to leave the music with the computer, but remove the authorization.

Answer 1

If you are giving the computer away you should not include music you've purchased: the purchase doesn't include the right to make copies to give to other people, which is what you would in effect be doing. The same applies to any purchased sofrtware which wasn't bundled with the computer when new.
The proper procedure when selling or giving a computer is to erase it completely and restore it to its out-of-the-box condition from the original disks. You should also make sure to include the disks which came with the computer.