Go to Bitwar and download a MAC version of Bitwar Data Recovery
You can buy the Apple OS-X operating system installer disk on Amazon and other places including the Apple Stores and the Apple on-line store. If you have an Intel-based Mac, this is a good time to upgrade to the "Snow Leopard" operating system for $29. It will eliminate the need for your original recovery disks. If you don't have a Intel-based Mac, you simply buy the "Leopard" OS disk. Either route will put a fresh OS on your Mac.