Symptoms
This issue occurs if you open Windows Store in Microsoft Office as a non-administrator user when the User Access Control (UAC) setting is disabled.
Resolution
To fix this issue, install the most recent cumulative security update for Internet Explorer. To do this, go to Microsoft Update. Additionally, see the technical information about the most recent cumulative security update for Internet Explorer. Note This update was first included in the MS16-009: Security update for Internet Explorer: February 9, 2016.
Status
Microsoft has confirmed that this's a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.