New answers tagged windows-98
Did you changed the Audio Controller to "SoundBlaster 16" (Under Setting, Audio) ? If you already did, it might be VirtualBox bug on SB16 emulation, refer to https://forums.virtualbox.org/viewtopic.php?f=6&t=12425 for more details. If it is the case, you might try DOSBox. Here is the comparision between Vbox and DOSBox ...
I changed the disk from dynamic to fixed disk, then created with fdisk the new drive. Then i rebooted, 'del' for bios, changed to boot from CD/DVD (.iso). Then formated C: and it worked.
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