Those discs you thought were done for because of scratches and years of use now have a second chance at working and all you need to do so is get some things together from around the house. You'll need toothpaste most importantly, some tissues, water and the actual CD you want to try and fix. Apply the toothpaste on the side of the disc which is to be read and the spread it around using your hands. Once its applied over the whole disc, use water to wash it all off. Then use the tissues to wipe clean the discs and to dry them off. That should do it, even though this process doesn't remove any of the scratches on the disc, it will make them easier to read.