Thanks. How do I remove the old painted over fasteners? I can't even see if there is a screw. Is there typically? Or will I need to pry it out somehow? Thanks.

Paint, screen, then touch up. They will probably get a little dinged up.

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Nope, just leave it be. A buyer is going to see the old windows. Nothing you can do to avoid it. Were I buying your house I would replace all the windows, even your new ones, because of the color.