Apple is no longer updating Quicktime for Windows, just in time for 2 vulnerabilities that leave PCs open for attack. The recommended fix is to uninstall Quicktime. If you're a video editor, and you edit on a P.C., here is what you can expect when trying to work with some of the more common file types.
http://www.snopes.com/2016/04/16/government-advises-windows-users-to-delete-quicktime/