Itunes cannot authorise more than 5 computers

Question

Within iTunes, I cannot get my work PC's iTunes to log into iTunes Match.  It says I cannot authorise more than 5 devices.  I have deleted devices, so that all that remains is a couple of iPads and a Macbook.  It is still saying this message.  It is very frustrating.
Please help me.

Answer 1

These steps may help you :
Begin by opening the iTunes program and going to the iTunes Store via the iTunes Store button in the top right.
Once you're at the iTunes Store, click on the Sign In button at the top left corner (if you're not signed in) or on your account name in the same location (if you're already signed in).
This will bring you to your iTunes account. 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. Click it.
A window will pop up asking you to confirm that this is what you want to do. Continue.
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.
Other Useful Notes About iTunes Deauthorization
1. 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.
2. 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.