I am working on a Windows XP Pro SP3 computer where both the DVD and CD drives are no longer showing up in My Computer of Disk manager. They were both working on 2/15/09 and disapeared sometime after that. They both show up in the BIOS and both have a yellow ! in device manager. Just to make sure it is was not a hardware issue, I tried a new DVD drive as well as new IDE cable and have the same issue.