Okay, I'm sorry.
I am using CS6.
All updates are installed.
Windows 7, also completely updated. 16GB of RAM and an i7 processor. 1 tb of storage.
I have no outside software or plugins installed in After Effects or any of my other Adobe programs.
I am making an animation using images to create a short animated video which is about 30 seconds long. The video has a voice over which follows it.
The video itself was originally created on a MAC and exported as a H.264 in a .mov container. It was sent through email to me so that I could put it inside of a website.
The video is pixelated and choppy when viewed in my computers quicktime, and won't even play in WMP. On the MAC it was created on, it plays perfectly.
I just don't understand why it would be having so many problems playing on my computer as I have never had this problem before.
H.264 in a .mov container is a terrible choice for export.
Try to get the video from your colleague in a different format/codec. Almost any format/codec combination would be a better choice than H.264 in a .mov container.
See these resources for suggestions: