dgVoodoo 2 uses DirectX 11 which is not supported on Windows 98. However there is dgVoodoo 1, to wrap Glide on Windows 98/2000/XP. I don't know will that work in a virtual machine though.
Thank you so so much for the response. What exactly does DgVoodoo1 wrap to or do?
But, it says it right there GLIDE. It is a 3D graphics API used only on 3dfx cards. Some games could only use 3dfc cards, and if you didn't have one game would be rendered in software mode using the CPU, which is slower and looks worse. With dgvoodoo you can use any graphics card.