If on Windows: I would try installing the Quicktime Codecs only. Codecs only because of security problems. Heres the link. https://www.apple.com/quicktime/download/ Then follow these instructions: Click on the Next button on the first page on the installation wizard. Accept the License Agreement. Select Custom install Only enable QuickTime Essentials. Disable everything else. If you use Sony Vegas, then you also need to install the QuickTime Player. Now you will be on the Destination Folder page. Uncheck the boxes for Install Desktop shortcuts and Automatically update QuickTime and other Apple software Click on the Install button. The installation will now begin. Click on the Finish button. Then restart your apps and try playing again.
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