.mov is a container. Your PC said to install Quicktime because it originated with quicktime, but if you don't have the codecs for the video/audio inside the container, it won't work.
Go to one of these sites (only one) and install the codec pack.
do not install both.
https
/www.codecguide.com/download_kl.htm
http

/www.cccp-project.net/
You can also use VLC as your media player. It includes its own codecs built-in so you don't need to install one. Every other media player out there uses Windows to decode the video for it, so relies on codec packs like above.
http
/www.videolan.org/vlc/index.html