The application “Microsoft Word.app” can’t be opened in Microsoft Office

Your MS Office may have become corrupted. Reinstalling Office can address problems that you may be experiencing.

I don't know what version of Office for the Mac that you have, 2008 or 2011.

The current version of Office 2011 is 14.4.9.

First - find your Office 2011 install disc with the product key # - and only then remove Office according to MS instructions

http://support.microsoft.com/kb/2398768

Or go here to DianefromOregon's site for help removing Office 2011:

http://www.officeformachelp.com/2012/12/office-for-mac-2011-remove-office/

Then Reinstall from DVD

Then enter your Product #

After successfully reinstalling Office 2011, update your Office product using the Software update within Office called Microsoft Update or going to the Help menu within Word or Excel or PowerPoint and select Update.

It may take a few times before you get to final upgrade to current Office version.

It should be 14.4.9 as of current date.

How to locate product keys

http://support.microsoft.com/kb/2279109

or here on locating product keys

http://office.about.com/od/MicrosoftOfficeMac/a/Best-3-Ways-To-Find-Microsoft-Of fice-For-Mac-Key-Codes.htm

Or

tp://try.officeformac.com/store?Action=ContentTheme&Locale=en_US&SiteID=msmacus& pbPage=CSTable&resid=VSGpKAoydBAAAINBCDQAAABU&rests=1428269373647

Note is updated as of April 27, 2015