I need to deauthorize only one computer, but I do not have the computer available to me

Question

We just bought a new computer for my daughter and she needs to set up iTunes.  The problem is that our account says there's five computers already authorized and we only have three in the house.  How can I deauthorize the ones we no longer own or have?  Only options at the sight are, deautorize all or this computer. 
thanks

Answer 1

You will need to de-authorize all your computers, then re-authorize the ones that need it.
I quote:
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.
Note: You may only use this feature once per year. The Deauthorize All button will not appear if you have fewer than two authorized computers. If you need assistance on using this feature, please contact iTunes Store support via email (http://www.apple.com/support/itunes/store/).