You are probably on the right track with the noted problem at the IDE controller. Try removing the device from Device Manager, then a reboot to rediscover it.
Windows 98SE - Athlon - 512M RAM
For no apparent reason, my DVD is not seen by my computer any more. I just used it earlier last month to run Turbo Tax, but yesterday, when I got ready to load a new program, my DVD was no longer listed in My Computer. The only thing I see with a problem, when I go to Device Manager in Control Panel, is I have a yellow diamond next to my Primary and Secondary IDE controllers - the Standard Dual PCI controller is OK. It says there is a driver problem with the controllers. It seems to be a "can't set to there from here" problem. I guess I need to reload the drivers, but I need the DVD to run the CD with the drivers programs. I am not even sure this is what is causing the trouble. Now what do I do?