BIOS does not recognise the DVDCD drive 279

Thanks Brian and all, this is as far as I've got to-date. The BIOS was succesfully updated and I have been able to install Windows 98 using the 98 floppy by typing ( D:setup) from the A: prompt. Windows 98 works fine on this installation and the DVD drive reads CD from it.

With the Windows 98 operating system installed, I have changed the 1st boot sequence to DVD and on a reboot, XP will pick up the DVD and start the installation before crashing part way through it. On the other hand.

If I remove the Windows 98 operating system by Fdisk and formating the hard drive and then try to install XP having set the 1st boot order to DVD, it does not start the XP installation disc and instead gives a message that the wrong disk is installed and to remove the disk and press enter.

I'm buttuming that as I've been able to install Windows 98 the system is in a reasonably workable condition. What I don't understand, is why BIOS will recognise the DVD drive and allow it to be set and saved, but will not pick it up when I reboot with a formatted hard drive. It does if Windows 98 is installed?