Can't install newer versions of iTunes and can't un-install current version

Question

HELP!
That's a good start to my first post I think lol... hey at least I'm still laughing, even though I feel like crying!
I am having (probably similar to many from what I can see from this forum and also from google search) problems updating my iTunes to the latets version.
Whenever I start to install the new version I get a message pop up saying that iTunes64.msi can't be located, even though it does exist in the default filepath it throws up anyway.
After doing some Google searches I saw that a way around this might be to use the Windows Unintaller Utility, however, I have yet to actually find this utility, particularly as Microsoft now appear to have removed all traces of it from their site as it seemd to be causing other issues.
Next I found an article on Apple that said that if I am having the problems that I have stated above then I should unistall various apple software items in a particular order with iTunes being the first on the list.
This is where I am now stuck! I can't un-install iTunes from Control Panel as it says that it isn't installed! Of course it is installed, however, it would appear that something somewhere is corrupt and it doesn't actually think it is really installed (I think my PC is suffering a sual personality... maybe that's what dual core really means lol).
The corrupt nature of my iTunes installation would also seem to be borne out by the fact that the icon in the list of installed programs for iTunes is not the normal icon but a blank (unrecognised) icon.
I am now clean out of ideas as I can't do any of the "normal" things to remove and re-install iTunes and so I could really use some help/advice.

Answer 1

Hi Katrina
Thanks for confirming my suspicions on the use of (or rather not) of the utility on Windows 7.
I also tried as you suggested to run the iTune64.msi file from it's location... it almost looked like it was working but then came up with the usual message saying it couldn't find the .msi file.
I even tried copying the file to another location but it still hit the usual error
I have a horrible suspicion that I am not going to get this sorted short of doing a complete re-install of my OS (which I don't fancy doing, particularly as at least iTunes is functioning anyway).
I am already planning to move away from Windows PCs and move onto a Mac in the very near future, so hopefully in the intervening time Apple won't release a critical udate to iTunes that means I need to update to continue certain functionality.
Roll on Mac-Day for methinks
Of course if anyone else can think of any solutions for me to try in the meantime then I would be more than grateful to hear from them and to give it a whirl.