Why can't I open any pdf files with any version of Adobe Reader after I upgraded?

Upgraded Adobe Reader not too long ago and after then it stopped opening pdf files. I had an old version of Adobe Acrobat and that opened the file no problem. I tried to downgrade Adobe Reader, but that didn't fix the problem.
Just tried to open Adobe Reader by itself without any files and it still crashed.
FYI – I’m using Windows 7 (Microsoft 2013)

It's not a good idea to have both Acrobat and Reader unless they're both of the same version number (like X or XI). Such a situation can cause all kinds of conflicts and crashes, as you've seen. Also, if you have an old version of Acrobat it's might not be compatible with your OS any more.

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