Can't install any application in windows 8( cmd is opening but cmd(admin) is not opening)

[KOILMANIC]

To change the default install location, I have followed the instruction given in thi page:

https://www.itechtics.com/change-default-installation-folder-windows-10/

Now no applications are installing & cmd is opening but cmd(admin) is not opening &also regdit is not opening

Also, I can't access administrator access.

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