My iPod won't sync to iTunes because my computer is not authorized. Tried authorizing and error message pops up?

Just noticed an error when syncing my iPod touch to iTunes...
Tried authorising and this message pops up...
After that, I tried to sync again and the same message pops up (1st one)...
Do you know any ways to fix/resolve this issue?

Try DFU mode and then restore               
  How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
iTunes: Restoring iOS software
- New cable and different USB port
- Run this and see if the results help with determine the cause
iTunes for Windows: Device Sync Tests
Also see:
iPod not recognised by windows iTunes
Troubleshooting issues with iTunes for Windows updates
- Try on another computer to help determine if computer or iPod problem

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