Make sure you have the latest QT version installed.
Open the MOV in the free download Media Info and note the resolution, frame rate and audio and video codecs it displays.
MOVs are just envelopes which can hold video files with any of hundreds of codecs, frame rates and resolutions -- so you need to identify the file's specs to know if it's editable video.
I Do have Quicktime 7.7.9 installed.
I do edit the videos in Element 13 and have done the videos in version 10 also.
Only thing that change was software reload due to virus.