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I have backuped my apps, books and songs in iTunes, but how about the data in apps, such as the saved angry birds' progress, the pdf files in adobe reader and so on?

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up vote 0 down vote accepted

You can save the whole iTunes folder(it should be at ../Music/iTunes directory) and just put it back after you reinstall iTunes on your new Windows system (new iTunes installation will put it's new "blank" folder in /Music, just replace with your backup copy).

By doing so iDevices will recognise your library as the one they had synced with before and will continue to sync with it like nothing happened, hence keeping all the saves on the devices.

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In addition to nkukushkin's answer, if you have any purchased iTunes content (videos, songs, etc.), you should deauthorize that computer from your iTunes account. You only get 5 authorizations per account, and one you do a reinstall, the only way to get it back is reauthorizing all your computers, which can only be done once per year. To deauthorize, click Deauthorize This Computer from the Store menu.

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