First disable all of the options and save the changes, then on the "Make your computer eassier to use" window, on the left blue pane under "Task" click on "Change Administrative Settings" and tick "Apply all settings to the logon desktop" and save that change. Unticking the boxes in the Ease of Access screen would only apply all of those changes on a per session basis, without ticking "Apply all settings to the logon desktop", so on reboot, FilterKeys would be back on again.
Hope I could help