I have a CD burner installed on my computer. I have tried to add a internal CD/DVD player to this same computer. When I do my other drive disappears from "my computer" I go to the device driver section and there in a yellow exclamation by that drive. When I open the computer back up and disconnect the CD/DVD drive and restart the computer the CD burner is there. I have done this before and I know I am missing a setting somewhere but I have lost the instructions to the drive. The CD/writer is at the end of the cable in the computer. I have tried changing the drive letter thinking they were both trying to use the same drive letter but that did not help. All attempts to install have failed. I run windows XP. Thanks in advance for any help.