Reason: There are three entries upper and lower in the registry. The first entry is for the CD ROM. This is the only entry you will need to delete in order for your drive to work.
You can try this method instead: Restart your computer and before the Windows XP logo shows, repeatedly press F8. Choose
Last Known Good configuration.
Or If the above method don't work. You will need use a bootcd that is capable of navigating the registry. One example is UBCDwin