|Your cdrom isn't drive B: A: and B: are reserved for floppy drives, although when booting from the 98 cd it may create a ramdrive at A: and bump up your floppy drive to B:|
Your cdrom isn't assigned a drive letter until you either boot from a cd or boot from a floppy or hard disk and load cdrom support.
If you end up with a c:\> prompt then either you're booting from the hard drive or the boot disk isn't seeing a valid dos partition on the hard drive. In your case I think you're booting from the hard drive. Set your boot order as 1) cdrom 2) floppy drive 3) hard drive. That way when you start the computer it'll go first to the cdrom. If there's a bootable cd in it then you'll get a message something like 'press a key to boot from the cd'. If you don't press a key it'll boot from the hard drive.
If there's no disk in the cdrom or no bootable disk in it then it'll go to the floppy drive. If there's a bootable disk in the floppy drive then it'll go ahead and boot from it. If there's a disk in the floppy drive that's not bootable you'll get an error message, although some bios' now just bypass the floppy drive if there's a non-bootable disk in it.
So if there's nothing to boot from in either the cdrom or floppy drive it'll go to the hard drive.
You say 'When I put the diskette (you mean cd?) into the CD-ROM drive it says it can't read the drive.' What are you booting from when that happens? What drive letter are you using for the cdrom?
Ding dong the witch is dead. . . .