Which controller are you using primary or secondary?
Also which device is master/slave? Do you have cable select on for either drives attached to the channel?
I would recommend moving the CD-RW off a primary channel onto the secondary, set it as the secondary master, set the other device as the slave. Don't use cable select.
In the bios, make sure the drive channel is set to auto for master and slave. If you have the option to reset the escd information, do it, it shouldn't hurt much.
Once windows comes back up see if a CD-ROM works. If it does, see if NERO picks up the drive under drive info. Next up is the media, then a burn test.