CS3 licensing has stopped working?

Recently my enitre CS3 Suite informed my that my "licensing has stopped working. Please uninstall and then reinstall the software." However the software disc is rejected by my 3 year old mac power book as there is some minor wear on the disc. So now what? The disc will read on a newer powermac so I tried to clone it but it is still rejected by my machine. All of the software is already on my mac but none of it will work because of this ridiculous reinstall requirement. How can I reinstall if the disc is unreadable on my mac? Is there a way to copy the disc so it WILL read?