If you are unable to enable 3D acceleration or the Enable 3D Acceleration option is grayed out in VirtualBox, follow these instructions to fix the issue.

If VirtualBox displays a black screen & is not booting the guest OS or not opening the installation window, you need to disable Hyper-V and 3D Acceleration.

For Windows, MacOS, and Linux operating system guests, VirtualBox offers to install Guest Additions.

If you need more, you can easily increase them from VirtualBox's settings. Open VirtualBox, highlight your virtual machine in the sidebar, and go to Machines > Settings > System.

Sun has released a major update to its VirtualBox cross-platform virtualisation software. Changes include support for 2D video acceleration for Windows guests.