Windows XP running under Fusion does not have direct access your host's video card. In a virtual machine, the virtual video card is a virtualized card with a subset of the host video capabilities. The virtual machine video card will never match what the real host card is this is why the Nvidia drivers don't install. VMware provides their own accelerated video drivers as part of the VMware Tools, so it's important to install those.

As for the OpenGL call, currently Fusion implements DirectX 8.1 (in 1.0) and experimental DirectX 9 support (in 1.1b1). Full OpenGL capabilities are not present.

VMware monitors these forums and they are aware of user's needs. Your request here counts as a small informal vote on OpenGL. Plus competitors are looking to differentiate themselves from VMware on this feature.

VMware maintains a list of working games and 3D apps in the 1.0 Release Notes and a new working list here: DirectX 3D Applications Compatibility List