I didn't read in detail but.....
Was it ever established that you are running Norton AV?
If so.....
You can disable Norton antivirus for MS Office applications. Open Norton antivirus, select options (you should have a split window with categories on the left and specifics on the right) under "other" is a category Miscellaneous there you will find the option to disable the "office plug in" simply un-check the checkbox, your applications should load much faster.
If not, there might be more that can be done.

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