ITunes won't run - says AppleApplicationSupport missing.

My iTunes won't open because it says the AppleApplicationSupport is missing. I checked, and it was there.
I uninstalled it, and then tried to re-install from most recent files available from Apple, but it won't install now because it says a new version is already there (although it is now gone and the version I'm trying to install is the latest avaible)
I had recently performed some registry cleaning and program elimination to help improve my computer's speed - so I'm sure botched something up.
Can anyone help?

For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
The section Install missing components has advice on breaking down the iTunes installer into the individual .msi files which might prove useful if Apple Application Support won't install normally.
tt2

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