It is obvious your scratch disk does not have enough space. I would say that truth about the memory problem is the Very Critical Memory Bug that comes with CS4. You can try to disable all the apps that are running at the same time, but the problem can be still here. Installing of a current AI version might help. Also try to save a TIF of the image in Photoshop, it could be a quick fix to the problem. Or reduced the pixels number.
If nothing helps, use a special software that is able to recover it. There are a lot of on network, but unfortunately not all of them are so good. Try Recovery Toolbox for Illustrator
https://illustrator.recoverytoolbox.com/
Oh, also i've remembered one method: Unlock all the layers and 'select all' and 'copy'. Than create a new doc and paste your image in there. Save the document with a new name.
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