Windows 8.1 Latest Updates , Apps stopped working

Dear All
Please help urgently.
Suddenly my Windows Explorer crashed and it recovered, and since then none of the apps are working in my system including store, settings, 3rd party apps etc. None of them.
On click any app black screen comes up for 1-2 seconds and it disappears.
Please help.
Thank you in advance.

Right click on start, click on Command Prompt (Admin). This will open command prompt window.
Copy the entire command powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode
-Register $Env:SystemRoot\WinStore\AppxManifest.XML
Paste it on command prompt window and hit enter. This will execute the command.
Check if this fixed the issue.

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