If you find you have reached 5 authorizations due to system upgrades, you can reset your authorization count by clicking Deauthorize All in the Account Information screen. Note: You may only use this feature once per year. The Deauthorize All button will not appear if you have less than 5 authorized computers or if you have used this option within the last 12 months.
To deauthorize all computers associated with your account:
1. Click Music Store in the Source list.
2. If you're not signed in to the store, click the Account button, then enter your account name and password.
3. Click the Account button again (your ID appears on the button), enter your password, and then click View Account.
4. In the Account Information window, click Deauthorize All.