SOLUTION 1:1. Open the Microsoft Office program and open its Options window. Click on Office ORB or FILE menu present in the ribbon and then click on Options.2. Now go to Advanced tab and scroll down to bottom. You'll find 'Ignore other applications that use Dynamic Data Exchange (DDE)' option present in General section.3. Make sure its unchecked. If its enabled in your system, disable it by unchecking the checkbox.4. Apply changes and restart Office program. It should fix the problem.
SOLUTION 3:You can also try to repair Microsoft Office suite with the help of following steps:1. Open Control Panel and click on Programs and Features icon.2. Now click on Microsoft Office entry present in the list and click on 'Change' button.3. Now select 'Repair' option and click on 'Continue' button.It'll repair Microsoft Office files and settings and it should fix the problem.