ITunes won't launch after upgrade - says files are missing

I had trouble upgrading to version 6 but disabled my anti virus software (McAfee) and the upgrade seemed to run OK. After restarting my computer iTunes won't run as it says files are missing and I need to install them. It was all working fine before. I have over 4200 tracks and I'm worried I've lost them although they are all still on my iPod. What do I do next? Please help.

Sorted! Panic over. I ran the download again and everythin seems OK.

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    **I just realized I've accidentally posted this under the Windows discussion. Sorry.
    Message was edited by: snwp2

    Sorted! Panic over. I ran the download again and everythin seems OK.

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  • ITunes post-upgrade: "Required files are missing"

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    Hello,
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  • ITunes won't open after upgrade. Help!!!!

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    replying to DanteSpyke
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    bbecker1221: Re: Itunes doesn't start up after installing upgrade :SOLUTION

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