Without being able to see the image you are working on it's really hard to give you a method but a lot of times it is much simpler to recreate the individual items. Rather than using a screenshot try using the import from web feature. file> import from web> and type (or paste) the page url into the dialogue box. The text should come across as text and all the graphics should import as separate graphics they will be jpegs or pngs, but they should all be in place and you can recreate or trace separate pieces to get better results.