Itunes wont install on vista, No digital signature

I had a problem were Itunes would not update or anything Apple related (quicktime etc) so i deleted Itunes and tried to run it as a fresh copy.
Yet when i download it and try to run the application i get the box from windows asking me if i want to run it, but in this box next to publisher it says unknown.
When i click run nothing happens. The box disappears and thats that.
If i click on the application and go into properties and go into digital signatures it says the digital signture is not valid. Ive tried downloading it with Explorer, Firefox incase that was it. I have even done a clean install of windows and tried to install itunes first incase there was a conflict.
Can anyone please help because its driving me nuts!

Mr. Peck-- Would like your advice re: where to post this question. I cannot update ITunes and Quicktime to the newest version using apple update in the windows environment. I have tried disabling antivirus software without help. Error is that it is not receiving a "valid signature." Installation on the mac side of updated quicktime and Itunes works fine. Windows version is XP SP3-- with appropriate updates.
Is there a solution that you know of? Where would you suggest posting this question?
Thank you,
Mark D

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itunes wont install, runtime error R6034 also 'apple mobile device' wont start! help!

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 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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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
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That's a rarer variation on this sort of problem.
(1) Download the Windows Installer CleanUp utility installer file (msicuu2.exe) from the following Major Geeks page (use one of the links under the "DOWNLOAD LOCATIONS" thingy on the Major Geeks page):
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Hey Folks,
Im trying to install itunes onto windows vista but i keep getting a message saying "iTunesSetup_exe - This file could not be downloaded.......Any Ideas?

Hello there, mad4musicdave.
The following Knowledge Base article provides some great recomendations for troubleshooting installation of iTunes:
Issues installing iTunes or QuickTime for Windows
http://support.apple.com/kb/HT1926
Additionally this article may provide additional insight on what may hinder a download:
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Hi HelpAimee!
It sounds like you may need to uninstall your version of iTunes and then reinstall the newest version:
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
http://support.apple.com/kb/ht1923
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Apple - iTunes - Download iTunes Now
http://www.apple.com/itunes/download/
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i have been trying to get iTunes to install on my computer for a few weeks now and have not been able too. I took my computer to Best Buy to have them install it and they said that the reason it wont install is because i have alot of spyware and virus, they wanted to charge me $80 to get rid of them so i told them thanks but no thanks.
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Thank you for using Apple Support Communities.
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Itunes wont install on vista, No digital signature

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