General Information
QuickTime is a powerful multimedia technology with a built-in media player. QuickTime lets you view Internet Video, HD Movie Trailers & Personal Media in a wide range of file formats.
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*** IMPORTANT NOTE: Apple no longer provides support for QuickTime for Windows due to security vulnerabilities. New versions of Windows since 2009 have included support for the key media formats, such as H.264 and AAC, that QuickTime 7 enabled. All current Windows web browsers support video without the need for browser plug-ins. If you no longer need QuickTime 7 on your PC, follow the instructions for uninstalling QuickTime 7 for Windows.
Referenced from: Apple.com