Why can't I install anything on my macbook pro?? PLEASE HELP!!

when i update a program, it will download fine but when asked to install i get this message - 'There is no default application specified to open the document"install iTunes".Than it gives me the option to 'choose Application' but i have no idea what to choose and anything i do click on just pop up this message 'The operation could not be complete. An unexpected error occured(error code-10814)'. PLEASE HELP!

I have this exact problem.
When I update or download anything it will download fine and then when I go to run or install it this comes up -
'There is no default application specified to open the document"install iTunes".Than it gives me the option to 'choose Application' but i have no idea what to choose and anything i do click on just pop up this message 'The operation could not be complete. An unexpected error occured(error code-10814)'
My software update is also not finding updates (on quicktime or itunes or anything) so my itunes does not recognize my iPhone and I cannot sync anything even though itunes (for example) asks to update.
So I cannot install anything new (like Spotify) and cannot update anything (like itunes).
Please let me know if you can help

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