system rescue cd failure reading sector from cd0

Im trying to run system rescue cd on my HP4250 laptop and im getting a read error on the disk. Its saying the kernel needs to be loaded first, oddly enough, even though this is the place where i choose the kernel (before it loads). The disk boots fine on another system, looks perfect condition, and is fairly new. I saw another instance of a similar problem where a guy was running mint disk or somethign and this happened, and the one suggestion was to turn off secure boot. What is that?