Hi,
Please perform the following steps:
1. Open Word, go to INSERT tab -> Apps for Office
-> See All.
2. In the new dialog, click Manage My Apps.
3. We can hide the Wikipedia app by click Hide in the new window.
4. Close Word, go to Control Panel -> Programs and Features, try to repair Office.
5. After repairing Office in Control Panel, go to
http://office.microsoft.com/en-us/store/apps-for-word-FX102802915.aspx?app=winword%2Eexe, re-add Wikipedia App for Word.
I hope this helps.
Regards.
Melon Chen
TechNet Community Support
