https://answers.microsoft.com/en-us/windows/forum/all/windows-store-missing/6addee3e-1a27-42e0-88e0-a4b3717658bc


**Check your Antivirus might be interfering with the Store, Try to disable it first.

**Make sure Windows has the latest update
Select Start , then select Settings > Update & Security > Windows Update > Check for Updates

**Check your time and location settings
Select Start , then select Settings > Time & Language. Select Date & time to verify your time settings and select Region to check your location. These settings need to show your current location and time zone.

**Check the Microsoft Store Install Service
Press the Windows Key + S and type in services.msc.
Find the Microsoft Store Install Service and double=click,
If Disabled, change it to Automatic, click Start and click OK.


**Run the troubleshooter:
Select the Start button, and then select Settings > Update & Security > Troubleshoot, and then from the list select Windows Store apps > Run the troubleshooter.

**Reset the Microsoft Store cache
Press the Windows Logo Key + R to open the Run dialog box, type wsreset.exe, and then select OK.
Note

A blank Command Prompt window will open, and after about ten seconds the window will close and Microsoft Store will open automatically.

**Reset the Microsoft Store app in Windows 10
Open Settings.
Go to Apps -> Apps & features.
On the right side, look for Microsoft Store and click it.
The advanced options link will appear. Click it.
On the next page, click on the Reset button to reset Microsoft Store to default settings

Uninstall the Store:
Press Windows key + X
Click and Run Windows PowerShell as Administrator
type: get-appxpackage -alluser Microsoft.WindowsStore
then take note the PackageFullName (we need it later)
Now Type: remove-appxpackage PackageFullName(you take note earlier)
Enter then proceed to reinstall Store

Reinstall the Store:
Press Windows key + X
Click and Run Windows PowerShell as Administrator
At the command prompt, copy-paste the following then hit Enter:

Get-AppXPackage *WindowsStore* -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

Launch again your MS Store

If it doesn't work, Please try to create a new administrator account then check if Microsoft is working there. Note: You may try to install microsoft there using the Powershell commands.

https://support.microsoft.com/en-us/help/402692...

If still doesn't work, Please try to Perform a Repair Install of Windows 10 with an In-place Upgrade. It will definitely help in resolving update errors. Performing this can repair broken operating system files while preserving your personal files, settings and installed applications. The in-place upgrade will also bring you the latest Windows update.


**Few things to check on the PC

Ensure you are signed in or have administrator rights to do a repair install

Unplug all external peripherals except for the Mouse, Keyboard, and LAN cable before starting

Disable or uninstall any 3rd party Anti-Virus program to prevent it from interfering with the upgrade


Please NOTE: You don't need to follow the instructions to turn off Secure Boot

Repair Install of Windows 10 with an In-place Upgrade
https://www.tenforums.com/tutorials/16397-repai...