Apple QuickTime is a media player that can be downloaded and installed for free on your Windows computer, not unlike Windows Media Player.
Last week, Apple ended support for QuickTime on Windows due to critical security flaws. Apple will no longer support or provide security updates for this software and recommends that it be removed. I have uninstalled it from my computer, and you should too.
For more information, see US-CERT for more information at https://www.us-cert.gov/ncas/alerts/TA16-105A, or read the TrendMicro article at http://www.zdnet.com/article/apple-deprecates-quicktime-for-windows-with-two-security-holes-unpatched-trend-micro/.
Instructions for removing QuickTime for Windows can be found on the Apple Uninstall QuickTime page.
Do it today!