jpegs that wont compile

Hello, 

I'm uploading AA publications (HTML5, JS) onto my website, but some of them have jpegs that cause a compilation error and render a blank, inert screen instead of the animation....when I delete them and re-publish, re-upload, the animation works fine. One jpeg is about 30 years old, the other is a free download from a photostock site.....I suspect both have something embedded in them that disallows functionality...I imported them into Corel Draw and exported them in different ways, but they still foreclose compilation....how do I clean them for unload?