Secondary IDE controller problem

Running Win98 on a PIII 450 with 64 MB RAM, I cannot see the CD drive.

This is strange for many reasons, not least of which. I installed the OS
from a CD!

The CD drive is visible to the BIOS, and works well if I boot to DOS with
the Win98 floppy.

In Windows there is a problem with the Secondary IDE controller (dual fifo)
– “The device is either not present, not working properly or does not have
all the drivers installed (Code 10)�.

I tried updating the driver, but Windows reported that it already had the
best one. I tried deleting the whole Intel 82371AB/EB PCI Bus Master IDE
Controller (from device manager) and rebooting, and both primary IDE and
secondary IDE controllers seemed to reinstall properly, but the problem was
still there.

To pre-empt a question, I am using the Secondary IDE controller because the
computer case is so badly designed I cannot get the CD drive on the same
cable as the hard drive.

I’d be grateful for any thoughts or advice on this one.