I don't have an ipad, and I never upload anything to You-tube. Don't even know how to.
So, what I am saying is basically commonly related info.
1. Windows only support the following video formats. Windows Media Player will not play any formats other than those listed below..........
- Video files: '.asf', '.avi', '.dvr-ms', '.m1v', '.mp2', '.mp2v', '.mpe', '.mpeg', '.mpg', '.mpv2', '.wm', and '.wmv'.
You will need a video converter to change .MOV .
Recommend selecting WMV. It's the safest format, fool-proof.
2. Can you not download the one you uploaded to U-tube and delete the one which refuses to open ?
Like you said, it could be corrupted after being worked on and tried on in so many different ways.