I ran an itunes update, but now itunes won't open as it says it hasn't been installed correctly. How do I reinstall it?

Go to Control Panel > Add or Remove Programs (Win XP) or Programs and Features (later)
Remove all of these items in the following order:
iTunes
Apple Software Update
Apple Mobile Device Support (if this won't uninstall move on to the next item)
Bonjour
Apple Application Support
Reboot, download iTunes, then reinstall, either using an account with administrative rights, or right-clicking the downloaded installer and selecting Run as Administrator.
The uninstall and reinstall process will preserve your iTunes library and settings, but ideally you would back up the library and your other important personal documents and data on a regular basis. See this user tip for a suggested technique.
Please note:
Some users may need to follow all the steps in whichever of the following support documents applies to their system. These include some additional manual file and folder deletions not mentioned above.
HT1925: Removing and Reinstalling iTunes for Windows XP
HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
tt2

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I don't know why this error occurs, unless you have attempted to downgrade iTunes.
This method should get you up and running again.
Empty/corrupt library after upgrade/crash
Hopefully it's not been too long since you last upgraded iTunes, in fact if you get an empty/incomplete library immediately after upgrading then with the following steps you shouldn't lose a thing or need to do any further housekeeping. In the Previous iTunes Libraries folder should be a number of dated iTunes Library files. Take the most recent of these and copy it into the iTunes folder. Rename iTunes Library.itl as iTunes Library (Corrupt).itl and then rename the restored file as iTunes Library.itl. Start iTunes. Should all be good, bar any recent additions to or deletions from your library.
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tt2

Ran a Software Update Yesterday, Now Safari Won't Open

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17" MacBook Pro 8.3
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try going to /library/internet plug-ins and deleting Flash Player.plugin , my Safari 5.1 will not work with this installed no matter what I do....

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iOS: Device not recognized in iTunes for Mac OS X
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If you connect the iPod to another computer does iTunes not see it?
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Whast model iPod and iPhone and what iOS version?
Syncing to a "New" Computer or replacing a "crashed" Hard Drive: Apple Support Communities
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Try:
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top fixes for a new iTunes install/upgrade are
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I ran an itunes update, but now itunes won't open as it says it hasn't been installed correctly. How do I reinstall it?

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