I am missing the file itunes.msi and can't upgrade to 10.5, please advise a fix

Question

Tryin to download latest update for itunes.
get error message that update process not finding the file itunes.msi and therefore the update installation stops.
And I can't uninstall itunes from Control Panel.........as it also needs this file to uninstall.
What to do?

Answer 1

There is a Microsoft fixit for uninstall problems which I haven't tried yet, but it is worth a go;
http://support.microsoft.com/mats/Program_Install_and_Uninstall
I would be interested to know if it works, otherwise:
This type of problem can usually be fixed with the Microsoft installer cleanup utility.
Unfortunately the Microsoft Installer Cleanup utility has been withdrawn by Microsoft because of compatibility issues with Microsoft Office so you will need to find a copy elsewhere – the installer is msicuu2.exe. You need version 3.
Google  msicuu2.exe download
mydigitallife in the above search has a copy of version 3
Check for malware before installing it.
After installing, To run the program  – All Programs>>Windows Install
If you get  permission denied error, Try Run as Administrator – an option if you right click on the program.
Now use the following method to remove iTunes and its components:
XP
http://support.apple.com/kb/HT1925
Vista
http://support.apple.com/kb/HT1923
*If you hit a problem with one of the uninstalls don't worry*, carry on with the deleting of files and folders as directed in the method.
When you get to deleting Quicktime files in the system32 folder as advised in the method, you can delete any file or folder with Quicktime in the name.
Restart your PC.
Run the Microsoft Installer Cleanup Utility. (Start > All Programs > Windows Install Clean Up)
Remove any references you find to the programs you removed - strictly speaking you only need to worry about those programs where the uninstall failed.
If you don’t see an entry for one of the programs that did *not* uninstall, look out for entries that start All Users that are blank entries or have numeric entries that look like version numbers e.g. 7.x for Quicktime or 1.x for Bonjour.
restart your PC
Download iTunes if you haven't already done so:
http://www.apple.com/itunes/download/
Try installing iTunes.