Download these fix files for every year (everyone reading this should do so as well).
https://support.cch.com/kb/solution.aspx/000041746
End all ATX services in task manager (Ctrl+Shift+Esc or right-click taskbar).
RUN THE FIX FILES YOU DOWNLOADED AS ADMINISTRATOR by right clicking and choosing 'run as administrator.'
This needs to be done on the computer where you ATX data is.