Computer already authorized but doesn't work. How can I fix it, please?

Hello everyone,
When I try to synchronize my iPod Touch with my PC (Windows 7), this message appears :
The iPod "x" could not be sinced because this computer is no longer authorized for purchased items that are on this iPod.
To authorize this computer for items purchased from the iTunes Store, choose Store > Authorized This Computer.
When I try to do that, an other message says :
This computer is already authorised.
Including this one, you have authorised one computer out of your available 5.
Actually, it is totally impossible to synchronize my iPod because of this problem. To fix it, I already tried this : iTunes repeatedly prompts to authorize computer to play iTunes Store purchases. But it changed absolutely nothing. I also reinstalled the last version of iTunes and retried that, but it didn't solve the matter.
Please, I need some help because I can't synchronize my iPod Touch anymore since two weeks.
Thank you very much,
Ark'

What OS X are you running and do you have USB or Wireless input devices...?
For wireless devices, take a look at > Troubleshooting wireless mouse and keyboard issues
USB keyboards and mice generally don't have connection issues, but they and there cords do occasionally go bad.

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