While running an update in Itunes i received an error message - Unable to locate component because AVFoundationCF.dll was not found. Then Itunes was not installed correctly. Error 7 (windows error 126) Do I have to reinstall and will I loose all my music?

While running an update in itunes (not installing), it stopped in the middle of the update and i receceived the following messages:
Application failed to start because AVFoundationCF.dll was not found. Reinstalling itunes may fix the problem. Then "itunes was installed incorrectly. Please reinstall itunes Error 7 (Windows error 126)".  If i uninstall and reinstall itunes will I lose all of my music, etc.?

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 press on)
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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    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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    Go to Control Panel > Add or Remove Programs (Win XP) or Programs and Features (later)
    Remove all of these items in the following order:
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    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.

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