I can't use iTunes! (Accidentally exited apple product updater in the middle of iTunes upgrade)

So I was installing the most recent version of iTunes (11.1.3  or something) with the Apple Product Updater and it was taking forever to install. I decided to exit becuase I had other things to do in iTunes which had closed due to the installation process. To speed up the process I brought out Task Manager and just ended the task and it disappeared.
Now iTunes is gone from my normal app search and if I go into the C:// Drive I can open iTunes with the iTunes folder located there (it doesn't have some file that lets it communicate with my device) but the iTunes folder in C://Program Files is completely wiped and I don't have access to it even though I'm the administrator of my computer with all-access. I opened the properties of the folder and it's 0 bytes. I tried uninstalling it via Control Center but unfortunately it encountered the same problem; it said I needed access to the C://Program Files/iTunes folder.
There was a try again button but no option to override with administrative functions. I tried deleting the folder in the C://Program Files but I had no access. Is there ANY WAY out of the situation without a complete OS reset? Please help.
If you want I can provide images of anything you like.

Does this help anyone? Can anyone tell if anything's missing? Because for the moment the whole of iTunes is rendered unusable for me.

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