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#11
Open regedit. Navigate to:
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
On the right pane right click on EnableLUA, click modify. Change the value from 1 to 0. Save changes and reboot your computer.
Note, this is a security risk. If you can run Your Phone app after setting EnableLUA to 0, then that will tell you that Windows itself is blocking the app, not antivirus. EnableLUA should be enabled (set to 1), but you can use this for troubleshooting.