Running xp, when i try to upgrade itunes from 11.0,0,163 to 11.0.4 it says itumes has invalid signature, will not be installed

i'm running xp - when i try to upgrade itumes, my computer says itunes has an invalid signature - try manual - so i do and get the same message - i know i've upgraded itunes before successfully - what does this mean?

Hi curliejo, 
Welcome to the Apple Support Communities!
In your situation I would recommend the steps in the following article for troubleshooting iTunes. It may be necessary to completely remove and reinstall iTunes in this situation. Be sure to remove all of the components with iTunes in the correct order as outlined in the article before installing fresh. 
Issues installing iTunes or QuickTime for Windows
Have a great day, 
Joe

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