Upgrading to windows 8 , hence will have to reinstall itunes , will all my playlist. apps synced with my iphone get deleted ?

i am upgrading to windows 8 , and i will have to reinstall itunes on my computer, will doing so delete all the data ? to be specific will it delete all the playlist n the stuff that i currently see in my itunes ? whats gonna happen to all the apps that i had downlaoded for my iphone ?

As given iTunes is not currently supported on Windows 8, however this is the approach that I would recommend when the time comes.
Backup the library with this User Tip.
Deauthorize the old operating system.
Install new operating system.
Restore the backup to your new system using the same tool used to back it up.
Install iTunes.
Keep your backup up-to-date in future.
This should give the new system a complete clone of the library that was on the old one. As far as iTunes is concerned this is still the "home" library for your devices so you shouldn't have any issues with iTunes wanting to erase and reload.
If you have an iOS device that syncs with contact & calendar data on your computer you should migrate this information too. If that isn't possible create a dummy entry of each type in your new profile and iTunes should offer to merge the existing data from the device into the computer, otherwise the danger is that it will wipe the information from the device.
If your media folder has been split out from the main iTunes folder you may need to do some preparatory work to make it easier to move. See make a split library portable.
Should you be in the unfortunate position where you are no longer able to access your original library, or a backup of it, then see Recover your iTunes library from your iPod or iOS device for advice on how to set up your devices with a new library with the maximum preservation of data. If you don't have any Apple devices then see HT2519 - Downloading past purchases from the App Store, iBookstore, and iTunes Store.
tt2

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