Apple’s advice on upgrading to Windows Vista:

If you are upgrading from Windows XP or 2000 to Windows Vista prior to the next release of iTunes, here are a few steps that will improve your experience when syncing your iPod or playing iTunes Store purchases once upgraded to Windows Vista.

- Deauthorize all iTunes Store accounts.
- Perform a clean install of Windows Vista (highly recommended but not required).
- Upgrade to iTunes 7.1 or repair iTunes using the iTunes installer if version 7.1 is already installed.
- Open iTunes.
- Choose Authorize Computer from the Store menu in iTunes.
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