All Files Show Read Only In Properties - Cannot Change

Virtually every file shows read only when I right click on it and choose properties. In uncheck read only, then click apply and choose applies to all subfolders and files. Windows appears to change the properties (a window opens up and a green progress bar fills). But if I click OK and close properties, when I look at properties again, they are shown as read only again.

This happens both when I am logged in under my user name, as well as if I log in as administrator.

The only difficulty it's created so far was when attempting ti embed a cover art JPG into an MP3 file in my music library.