Ok well if you find a driver on the manufactures webpage you can just replace the old one otherwise if you havent tried what I said above try it since windows will reinstall the drive at the second reboot and then you can choose another drive (this normally works for me).
@Scuddie: Yes it would since the HDD has a much higher transfer rate then a CD/DVD and IDE interface is parrallel and so the main bus on the chipset must adjust to the speed of both drives on the same cable, therefor if oyu have one fast HDD and one slow CD/DVD working at the same time the HDD will be slowed down by the CD/DVD.
So what you really want to do is just use SATA, the cables are smaller also
/Dice
EDIT: Ok did some reading and I might not have been entierly correct about the speed, there is a speed impact but not for the reason i remebered but for something called "One Operation at a Time" read about it at
http://en.wikipedia.org/wiki/AT_Attachment