I am trying to upload itunes 10.5, but get a message "There is a problem with this Window Installer Pkg. A program required for this install to complete could not be run.  Contact your support personnel or package vendor".  What is it I need to do?

I am trying to install itunes 10.5, but during the download I get the following message, "There is a problem with this Window Installer Package.  A program required for this install to complete could not be run.  Contact your support personanal or package vendor."  If this is my personal computer and was able to upgrade to the previous version (pre 10.5), why not now?  What is my "package vendor"? And what is it I need to do to fix this?  The message is unclear.  Unfortunately, I deleted my itunes program, thinking that in doing so, 10.5 would finally load.  Now I have no itunes on my computer and unable to sync my iphone.  Help!
Thanks - Rick

Hi Rick,
by "repair" I mean I went to the control panel, option - programs and features, and in the list of all my installed programs I selected "Apple Software Update". On top of the screen you find the options Uinstall, Change and Repair. I clicked the repair button and that did the trick. After the repair I could uninstall the program. I also uninstalled iTunes, Apple Application Support, Apple Mobile Device Support en Bonjour, thus all Apple programs. Then I installed iTunes 10.5 again and everything went fine.
Success,
Peter

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