ADE not functioning, new downloads different

I got a new-to-me Windows 7 laptop and installed ADE with a free Norton trial.  The downloaded ADE worked fine for about half an hour.  Then I opened a book from Kobo and the ADE software changed.  It no longer displays the library and won't open books.  If I buy a book with DRM, it will put the book in My Digital edition file but not open it. I can't transfer the DRM book to my e-reader (Kobo Aura).  The toolbar now reads File, Edit, Reading, Help instead of File, Library, Help.  I have uninstalled and re-downloaded ADE multiple times but it comes out the same.  Some of those downloads were done with the Norton firewall disabled and using different browsers.  When I tried the alternate download method using ADE 4.0 zip, the library format was there but it would not read my library or open books.

I downloaded ADE onto another computer without the Norton trial and it works.  I copied the installation file onto the laptop but it still doesn't work right.

Does anyone know what is wrong and how to fix it? Is this a known problem with Norton?

I really would like to run this using my laptop.