In Reader XI the protection mode box to uncheck is under Privacy but this still does not work for me. I have Windows 7 Enterprise, Adobe Acrobate X Pro, the entire Adobe suite actually was added back in Sept 2012, and I have Adobe Reader XI which I 1. Uninstalled 2. Restart 3. Open word tried insert object (PDF) = Failed to solve the problem, 4. Re-stalled Adobe Reader 9.5 2. Restart 3. Try again to insert PDF = Failed to solve the problem. This worked fine back in Nov 2012 besides trying to uncheck the security setting in reader I also did a search for "AcroExch" and there was no file by that name.