For anyone who hates DC ... this is how to revert back to XI
Uninstall DC via Control Panel (make sure all documents and document folders are closed)
Then click on this link:
Adobe - Adobe Reader : For Windows : Adobe Reader 11.0 - Multilingual (MUI) installer
You'll receive a zip file - run the setup.exe
Be patient through this process, it takes a little while, but it's worth it to have XI back up and running.
Oh, and when you get the option to automatically download updates, I selected a manual review rather than automatic.