Whenever I try to update iTunes to 10.5 I get the message 'There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor.'

Whenever I try to update iTunes to 10.5 I get the message 'There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor.'
I then uninstalled iTunes to try and reinstall it but I still get the same message for both 10.5 and previous versions, please help!

My situation:
- get error when updating iTunes from 1041 to 1050 or above: "There is a problem with this Windows Installer Package. A program required for this install to complete could not be run. Contact your support personnel or package vendor."
My system: XP SP3 with all latest updates.
Found out that the 1051 update fixes a major intrusion possibility during the update process, so I want to get iTunes upgraded to 1051.
Did more research and the following worked (not known if all steps outlined were necessary) (I do not guarantee success nor any more issues as a result):
- ran: MicrosoftFixit.ProgramInstallUninstall.exe (did JUST the patch option).
- ran: Windows Installation Removal Tool.exe (uninstalled JUST the iTunes program installer folder) (this does not remove the actual program).
- removed all apple software update registry entries.
- removed: C:\Documents and Settings\All Users\Application Data\Apple\Installer Cache\(JUST the software updatefolders) (hidden folder).
- removed: C:\Documents and Settings\current user\Local Settings\Application Data\Apple\(JUST the software  update folders) (hidden folder).
- DID NOT need to restart
- downloaded latest iTunes update (1051)
- opened using WinRAR
- extracted all files
- ran JUST the apple software update MSI
- it succeeded
- ran JUST the iTunes MSI
- it succeeded
- normally I then uninstall the apple software update program, but DID NOT this time
- DID NOT need to restart
Hope it works for you.

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