Need permission from the administrator

[EpicTheron]

I am the sole  administrator  on my PC it even says so when I go to the settings of Windows 10 and look at my account and it says  administrator but I am trying to download a anti virus on my PC that i just built but this message keeps popping up when i try to set a download location "you need permission form the administrator". I even went onto where i tried to download it and right clicked on it went to properties and went into the security tab and even there it says that I am the administrator.  I have only 1 user account on my PC and I am about to pull my hair because I have been online for hours looking how to fix this problem