I'm having the same problem I've seen others write about with CS6 and Acrobat X Pro not launching every now and then. I've tried the solution of deactivating in another CS6 application and reactivating, but it hasn't worked in the past.
I'm running Windows 7 Professional. In Programs and Features, I have the following applications listed:
Adobe Acrobat X Pro - English, Français, Deutsch
Adobe Creative Suite 4 Design Standard
Adobe Creative Suite 5 Design Standard
Adobe Creative Suite 6 Design Standard
Each time I have the problem, I uninstall the first one that I listed above. I also click on the last (CS6) and uninstall only Acrobat X. Then I restart the system and reinstall CS6 Acrobat only.
I presume I still have CS4 and CS5 listed because I upgraded from one to the next. I don't use the old versions anymore. Should I remove any of these permanently? Would that help solve the problem? Even though I uninstall the first one, it always comes back when I install Acrobat through the CS6 setup file.
Thanks for any suggestions! This uninstall and reinstall is getting very annoying. I used to think it happened only once a month, which was bad enough, because it always interrupts my work flow to not be able to open a PDF file as usual. But then, after reinstalling this past weekend, Adobe updated Acrobat on my system last night, and this morning the problem occurred again, only a couple of days since the previous time. That's even more frustrating!