I updated to latest version of iTunes and it isn't working.  What do I do?

I downloaded iTunes update 12.0.1 to my Windows 8 computer, and it did not open when I finished.  It gave an error message that it cannot find iTunes.  I tried uninstalling and reinstalling iTunes 2 or 3 times.  I'm afraid I lost all my music.  It still opens with the same error message.  How do I get iTunes back?

Actually, Chris, I found that page yesterday on my own doing a search, before I wrote my post.  After your instructions didn't work, I found that page and tried deleting the iAdcore.dll and that did not work.  When I tried to open it said it didn't have the iAdcore and could not be opened.  There was no QTMovieWin there to delete.  I again uninstalled everything in the order listed on this new page, because there were 7 things to uninstall (not 5 as your last page suggested).  I found that I had iCloud so that was deleted in the proper order.  Did not have MobileMe on the computer.  Also deleted Apple Application support, which wasn't on your list either.  I restarted the computer.  I looked for any files on drive C program files as indicated, and did not find any of those files.  I went to the iTunes page and downloaded the latest version yet again (maybe the 5th time?).  And I got the same notice:
"The  iTunes Library.itl cannot be found or created.  The default location for this file is in the iTunes folder in the music folder."
I went to that iTunes folder in the music folder there are a number of iTunes library folders and none of the open except one.  The ones that don't open give me the same dialogue box as above.  The last folder opens to a page of codes, I guess that's what it is.  Gobbeldy gook to me.  But that folder is listed at the top in the URL as itTunes Library.xml.  I don't see any .itl.  Is that the folder I need?  And how do I get that??
I don't know if that last paragraph is significant, but I thought I'd include just in case it is.
BTW, can I just download an older version of iTunes?  And how can I find it?  I still have the old version on my old computer which is at home.  Not sure how to get it from that to this one.
Thanks for hanging in there with me.  Perhaps there is someone else who could help if you can't figure it out.

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