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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
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
Windows Vista Ultimate, Windows Vista Ultimate 64-bit Edition, Windows Vista Enterprise, Windows Vista Enterprise 64-bit Edition, Windows Vista Business, Windows Vista Business 64-bit Edition, Windows Vista Business N, Windows Vista Business N 64-bit Edition, Windows Vista Home Premium, Windows Vista Home Premium 64-bit Edition, Windows Vista Home Basic, Windows Vista Home Basic N, Windows Vista Home Basic N 64-bit Edition, Windows Vista Home Basic 64-bit Edition, Windows Vista Starter