How to de-authorize computers that have stopped working?

Question

I got a new computer for Christmas and I downloaded iTunes. When I was syncing my iPod, a message popped up asking me to authorize my computer or else many of my apps would be deleted. So I did. After I did it, something like this popped up:
"Thank you, you have authorized 4 out of your available 5 computers."
I know what that means, but I only use ONE of them. All of the other 3 computers have crashed or stopped working, so I can't log back on to iTunes on them and click the thing that says "deauthorize this computer." Is there anyway I can de-authorize them without logging on to them?

Answer 1

De-authorizing Computers (contributed by user John Galt)
You can de-authorize individual computers, but only by using those computers. The only other option is to "de-authorize all" from your iTunes account.
  1. Open iTunes on a computer
  2. From the Store menu, select "View my Account..."
  3. Sign in with your Apple ID and password.
  4. Under "Computer Authorizations" select "De-authorize All".
  5. Authorize each computer you still have, as you may require.
You may only do this once per year.
After you "de-authorize all" your authorized computers, re-authorize each one as required.
If you have de-authorized all computers and need to do it again, but your year has not elapsed, then contact: Apple - Support - iTunes - Contact Us.
For more information on authorization and de-authorization: iTunes Store- About authorization and deauthorization.