No.
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First make sure you have iTunes and an iTunes account. To get iTunes, go to apple.com/itunes, download and install this. Then create an account. With your iPod you should have got a white cord that connects from your iPod to the usb port in your computer. Connect these two. It should tell your computer you're trying to connect to iTunes, if it doesn't find iTunes on your desktop or in your start menu>programs (considering you're working on Windows). It should pull up for you to sign in, then register your iPod through your iTunes which is a step by step process on the iTunes. And you should be connected.
Download the itunes installer from http://www.apple.com/itunes/download/ . This works for xp and vista.
no. Only the iTunes software is updated your music is not touched. If you re-install it, some data may be lost (But that is not what your doing)
iTunes can be installed on any computer running Mac OS X or Windows that meets the requirements: Macintosh Software ▪ Mac OS X version 10.4.10 or later▪ QuickTime 7.5.5 or later▪ 200MB of available disk spaceWindows Software ▪ Windows XP Service Pack 2 or later, or 32-bit editions of Windows Vista▪ 64-bit editions of Windows Vista or later require the iTunes 8 64-bit installer▪ QuickTime 7.5.5 or later is required (included)▪ 200MB of available disk space
The both versions (32-bit and 64-bit) of Windows 7 are supported.