How do you deauthorize all 5 computers from one computer?

In the top box, you'll see a section labelled Computer Authorizations towards the bottom. Next to it is a button that reads Deauthorize All. A window will pop up asking you to confirm that this is what you want to do.

In just a few seconds, all 5 computers on your account will be deauthorized. Now, re-authorize just the computers that you still use and you'll be all set. It's important to note that the Deauthorize All option is only available when you've used all 5 authorizations for your account and can only be used once every 12 months.

If you no longer have access to a computer using one or your authorizations, or that computer no longer works, it can be pretty difficult to remove that authorization. In that case, it may be better to use friends' computers to reach the 5 authorization limit and then follow the Deauthorize All steps above. If you plan to give away or sell a computer, or install a new hard drive or reformat the existing one, deauthorize the computer first.

Otherwise, the computer may end up taking up one or more of your 5 authorizations when it shouldn't. Got a tech support question? Ask it in the discussion forums.