How to delete all authorized computers in iTunes?

How to delete all authorized computers in iTunes?
I have problems to sync my iphone to my pc and add music and photos.

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.

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