I cannot update  iTunes because when I run the Apple Software Updater, it says "'iTunes   QuickTime' has an invalid signature. It will not be installed." If I try downloading only it says "'iTunes cannot update.  Invalid signature.

I cannot update  iTunes because when I run the Apple Software Updater, it says "'iTunes + QuickTime' has an invalid signature. It will not be installed." If I try downloading only it says "'iTunes cannot update.  Invalid signature.  Can someone help?

This forum is for questions from those managing sites on iTunes U, Apple's service for colleges and universities to post educational material in the iTunes Store. You'll be most likely to get help with this issue if you ask in the general iTunes for Windows forums.
Regards.

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    What am I supposed to do???
    I have tried and tried for weeks now.
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    2. I click on "Install 1 Item"
    3. I click on "accept"
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    5. "iTunes + Quicktime" has an invalid signature. It will not be installed.
    and after i click okay it says if problem presists then click on tools>Download only...
    i did that and it STILL SAYS THE SAME THING!!
    HELP!?!?!?

    I don't understand it ... but it works..
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    2. I click ok -- DO IT!!
    3. I get the error -- "quicktime has an invalid signature".
    3a. I google the phrase
    4. I come here are read these pages ...
    5. I go to microsoft,com and do not find SP3 for XP .. and think that the comments here are "right on" that is not the first choice .. gettting something "new" from Mr. Gates and his crew.
    6. I go to apple.com ...download the files
    7...... and all is well??!!!!
    8.... wondering ...where does that pop-up come from that asks me to update ..?? if not from apple??!!
    Oh Well ... Very happy now ... thank you all for taking the time to input...and educate this old man.
    Respectfully,
    CP

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