I have the same issue as many, Windows 10 Store won't open. I have run the command everyone list in powershell in the administrative mode, when I attempt "winreset.exe" command I get the message "You'll need a new app to open this ms-windows store" anyone have a next step?

Run the apps troubleshooter included within Windows OS manually by following the steps below and check if the issue persist.

In many cases, the Windows Store will automatically notify you if there’s a problem with an app and try to fix the problem. If you continue experiencing problems with an app, this tool can automatically identify and fix some problems with apps and the Store.

Type troubleshooting in the search box next to Start icon and select the top most search result.

Click on View All from the left hand screen panel.

Select Windows Store apps, click on Advanced option and check Apply repairs automatically option.

Follow the on screen instructions.

You can also run the automatic App troubleshooter from the link below and check if the issue is resolved:

http://windows.microsoft.com/en-us/windows-10/run-the-troubleshooter-for-windows-apps