Microsoft has acknowledged that Office 2013 "Click-to-Run" has failed for some users since applying the June Patch Tuesday updates. The company says that "less than 1 percent of our user base" has been so affected.
Microsoft released many non-security updates for Office 2013 on Tuesday, June 10.
Click-to-Run is a streaming and virtualization technology with which users may run a current version of Office without having it fully-installed on the local computer. Code streams from Microsoft's servers as-needed, allowing users to run Office programs quickly, before they are completely installed.
The Office team is working on a solution. In the meantime, for users who, since applying the update, cannot launch Office 2013 using Click-to-Run, the company first recommends that they uninstall Office 2013 using this Fix it. Then they need to reinstall Office from the My Accounts page; in a business setup, the administrator may need to be involved.