I have a 1.6 Ghz computer running Win XP home. All of a sudden my two
DVD drive letters were missing in my computer. I went to device manager
and found the following and all have yellow marks on them:

Windows successfully loaded the device driver for this hardware but
cannot find the hardware device. (code 41) All three below had this
statement.

DVDRW DRW-55163
IDE DVD-ROM 16X
VOBID InstantDrive CD SCSI CdRom device

I tried to troubleshoot and said it could not help.
I went have in time with system restore-no help.

I have a Trios II hard drive selector switch with the second hard drive on
this computer running Win 98se. I switched to this hard drive and both
DVD Rom drive worked with the drive letters showing up. It is not
a hardware problem within the computer.

How do I fix this? Jerry