How do I remove iTunes from an old computer

Question

How do I de authorize an iTunes from an old computer

Answer 1

If you no longer have the computer, you will have to deauthorize ll computer and then start over again.
To deauthorize a computer
Open iTunes.
From the Store menu, choose Deauthorize This Computer. (In earlier versions of iTunes, access this option from theAdvanced menu).
When prompted, enter your Apple ID and password, then click Deauthorize.
Remember to deauthorize your computer before you sell it, give it away, or get your computer serviced. Also, make sure you deauthorize your computer before you upgrade your RAM, hard disk or other system components, or reinstall Windows. If you do not deauthorize your computer before you upgrade these components, one computer may use multiple authorizations.
To deauthorize all computers associated with your Apple ID
If you need to authorize your new computer and are unable due to already having five authorized computers, you can deauthorize all computers by doing the following:
Click iTunes Store on the left side of iTunes.
If you're not signed in to the store, click the Account button, then enter your account name and password.
Click the Account button again (your Apple ID appears on the button), enter your password, and then click View Account.
In the Account Information window, click Deauthorize All.