Error Code 0xc00d5212 When trying to open .mov from render queue

I have been having trouble with the quality of my videos, so I followed this tutorial. 
After rendering, I try to open the file and am greeted with this error.  

What's a way I can fix this error? If I render from Adobe Media Encoder it looks very low quality. Note that I do need to send these videos to clients for them to be able to post on social media.