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Reauthorize your computer. To do this, follow these steps:
Start iTunes 7.1.1.
On the Store menu, click Authorize Computer.
For more information about issues that may occur when you use the Safely Remove Hardware feature to eject an iPod on a Windows Vista-based computer, click the following article number to view the article in the Microsoft Knowledge Base:
933824 The Safely Remove Hardware feature and the Windows Explorer "Eject" command do not work correctly with an Apple iPod that is connected to a Windows Vista-based computer
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