I have a windows 7 64x SP1 and every time I install iTunes 12 I get this message when I try to ponen it:"This copy of Itunes is damaged and it has not been correctly installe. Please, install iTunes again.(-42404)". The instalation process runs smoot

I have a windows 7 64x SP1.
Every time I install iTunes 12 I get this message when I try to open it:"This copy of iTunes is damaged and it has not been correctly installed. Please, install iTunes again.(-42404)".
The instalation process runs smoothly without any error message and iTunes has been installed in my computer before. The problem started with the update no. 12. Any idea what's going on? Thank you

if itunes will not run, you probably have mangled windows badly
one feature of windows 8 is the refresh that saves libraries,
because you are using windows 7, you will need to backup all files to another storage device

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