cd-rw/dcd will not write suddenly, help!!!

My Sony Viao's cd-rw/dvd rom will recognize the hardware but not write anymore. I reinstalled XP with a different XP cdrom and a different product key. I was told by someone that with VIAO's, if I needed to reinstall XP I should've used the origional os installation disks and the product key on the bottom of the VIAO but it was too late- I had already installed the other copy. So, can someone please tell me that there's something I can do to have my cd-rw back? [email protected]