You need quotes around the destination since there is a space
You can try and add /C
You can try to take ownership of WindowsApps and then grant full access to the administrators group. Looks like only Trusted Installer and SYSTEM have write access to this directory.
Click on Change and makes administrators the owner, then you can give administrators full access
You need to change it to administrators you cant access the SYSTEM account,
This:From an elevated command prompt type icacls "C:\Program Files\WindowsApps" and post the output.
No, the permissions look fine. You will either need to try and repair the corruption with the commands in reply #55 or re-install Windows. Those are about your only options at this point.