I take it you're using Windows 10 Home edition. That would mean that the best way to install, or uninstall, the 757 Captain, would be to right click on the installer/uninstaller, and select "Run as administrator" from the list if it's available. Try that with reinstalling the 757 Captain, and then uninstall it, to see if it uninstalls the ACE when you uninstall it. It's worth a shot.

I have Windows 10 Pro, and because of that, I don't know exactly what Windows 10 Home edition users can, or can't, do. :-/