http error uploading photos

I am having a hard time uploading photos on word press. I have read several threads and tried adding code, uninstalling all my plugins, adding plugins. And nothing has worked. The photos will upload if I try ten to twenty times.

When I upload the photos, most will produce an http error code. A link for this photo will show up in my library without a thumbnail. If I click on the link it will show a large version of the photo. If I try to edit the photo or place it in a blog post I get this message. “Image data does not exist. Please re-upload the image.” I am close to tears.