All of a sudden PDFs wont open when double clicked...

Hey guys, I recently installed cs6, and all was working fine. I havent made any changes recently....
But today I tried double clicking a pdf i downloaded and it looked like it when to open but it didnt.  I restarted my machine thinking it needed a restart.  Still didnt work.  Tried other pdfs still nothing.
Does anyone know how to fix this?
Thanks

The KB link you shared is for a different issue altogether in which a licensed software reverts to trial mode on launch.
That is not your case.
If you want to set Acrobat or Reader to be the default while opening pdf's please follow the steps below :
Please launch Acrobat.
Click on the 'Edit' button in the toolbar, and then select 'Preferences'
A new window would come up. On the left column, higlight the 'General' Tab and on the right hand side at the bottom there's a button called 'Select Default PDF Handler'
Click the button and select 'Acrobat' as the default for PDF's.Click on 'Ok' now to save the changes.
Alternatively, you can simply right click on any pdf file and then select 'Open With..' > 'Choose Default Program' and select 'Acrobat' from the list of programs.
Make sure the option at the bottom is checked that says ' Always use the selected program to open this kind of file'.
Click on 'Ok' now to save the changes.

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