Unable to open PDFs in IE11. Error 0:104.

Been getting an error when trying to open any PDF in browser:

"There is a problem with Adobe Acrobat/Reader.  If it is running, please exit and try again.  (0:104)

This is the envrionment:

OS:  Windows Server 2012 R2 (RDS)
Adobe Version:  Running both Adobe Acrobat Standard XI (11.0.07) and Adobe Reader DC (2015.017.20053)
Browser:  IE 11 (11.0.9600.18427) and Chrome (PDFs work fine in Chrome)

Steps I have already tried:
- Repair on both Adobe versions
- Complete uninstall and reinstall of Adobe
- Reset IE
- Verified default registry value was correct at HKEY_CLASSES_ROOT\SOFTWARE\Adobe\Acrobat\Exe
- Disabling "Adobe PDF Reader" addon in IE does work, but is not an acceptable solution for us.
bankonitAsked:
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bankonitAuthor Commented:
Ended up figuring this out (sort of).  Something is up with Adobe Reader DC.  I uninstalled it, and then installed Reader XI instead, and PDFs in the browser are working fine now.  Wondering if the ActiveX for DC doesn't jive well with IE 11.  Not sure, but I'm just glad it's working now.  Thanks for the help!
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Jackie ManCommented:
Adobe Acrobat Standard XI (11.0.07) and Adobe Reader DC (2015.017.20053)

What is the sequence of installation?
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bankonitAuthor Commented:
Because it worked.
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