Rebooting and Reinstalling Itunes.

Hello all,
I plan on rebooting my Windows 7 64bit laptop from scratch.
However I have already sync'ed my ipad2 with the itunes library in the laptop. Also, it is already authorized. I know that when I want to switch itune libraries, syncing into the new library will delete all the files in the iOS device
How do I reboot my laptop & reinstall my itunes library and sync my ipad 2 safely without having to delete all my files in the ipad2 during the sync?
Any tips/pointers will be greatly appreciated!
+Michael K
PS: I also realized that I have used up 5 out of 5 authorizations in iTunes. However, the previous 4 were in previous reboot attempts, so now I think I am screwed in that area... What can I do about that?

"Reboot" essentially means to turn it off, and turn it on again. You are thinking of rebuild or reinstall.
Backup up iTunes folder to an external drive. Backup all your other personal data, downloads, email history, driver files etc. etc.
Rebuild your computer from the installation discs.
Restore your backed up data.
Install iTunes.
Your iPad should sync as if nothing had been changed.
At the simplest level you can backup your library by just copying the folder to an external drive, however I'd recommened you use SyncToy  2.1 so you can prepare your backups in advance of the rebuild and update them just before you go ahead. See this post on how to set it up.
Once your library has been synced to the external drive you can even test it out to reassure yourself that it will be possible to work with the new copy of the library until it is restored on the rebuild machine.
If you have five authorisations you can reset all five using the "Deauthorize All" command. This cannot be reused for another year. In future you should deauthoize any computers you no longer wish to use or are about to rebuild.
tt2

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