
- Open iTunes, sign in to the iTunes store.
- After signing in, view your account through -> Store -> View My Account. ( You may need to enter your password again. )
- In the Account Information window, click Deauthorize All.
- Done!
Now, you're ready to authorize your new computer.
For more information: http://support.apple.com/kb/HT1420
For more information: http://support.apple.com/kb/HT1420