How To Disable the Windows Store on Windows 10
You can do this by two ways. First, using the Group Policy Editor. Second, using the Registry Editor.
With Group Policy Editor
1. Press Windows Key + R and put gpedit.msc. Click OK or Press Enter. It opens the Local Group Policy Editor. You can refer how to fix "Windows cannot find gpedit.msc" in Windows 10 from this tutorial.
2. Navigate to: Computer Configuration / Administrative Templates / Windows Components / Store
3. Locate the "Turn Off Store application" setting in the right pane.
4. Select "Enable" , and lick "Apply" and then restart your computer.
With Registry Editor
1. On your keyboard, press the Windows logo key + R at the same time, and then type in regedit and click OK.
2. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsStore key.
3. In the Windows Store key, you will have to create a new DWORD value. Name it RemoveWindowsStore and set the value as "1". If the WindowsStore key does not exist itself, you need to create it.
4. Restart your Windows 10 PC