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That’s not a lot of information to work with, but some suggestions that have been offered on Microsoft’s forums might work for you:
1. Sync the app license.
2. Reset Windows Store.
3. Download and run UI troubleshooter app. http://download.microsoft.com/download/F/2/4/F24D0C03-4181-4E5B-A23B-5C3A6B5974E3/apps.diagcab
3. Try a clean boot.
4. Boot to normal startup and run System File Checker.
Here is a link to a Microsoft Community question and reply that will give you instruction for each of the above steps, if you need them. Good luck.