Most people can use Nero and Easy CD Creator together if they do the following (Win98):
Hit Start / Run / msconfig / Startup
Uncheck Adaptec DirectCD
Uncheck CreateCD (optional but I recommend it)
Turn off Auto Insert Notification in Device Manager for all CD-ROM drives
Create desktop shortcuts to start DirectCD and Easy CD Creator or use the Start Menu.
Rename the following .vxd files in Windows\System\Iosubsys to:
Atapchng.bak
Necatapi.bak
Scsi1hlp.bak
Torisan3.bak
If you want to use DirectCD, to avoid problems auto insert notification (AIN) should be enabled for the burner. Reboot after enabling it.
If you want to use Nero after using DirectCD, you can use Cntrl-Alt-Del to remove DirectCD. If AIN is on, Nero recommends disabling AIN, so it is better to disable AIN and reboot before using Nero.
Note that disabling DirectCD from loading at startup does not keep it from loading background drivers, so it is still running in the background. What is disabled is the executable shell that provides auto eject among other control functions. See:
http://www.fadden.com/cdrfaq/faq03.html#[3-45]
In any event, even though it is still in the background, it appears to coexist with Nero if the preceding steps are followed.