Error message: "failed to create D3D device!"

DLed and installed via mirrors, launched, and then - “failed to create D3D device! Refer to forum…” pops up. Has anyone encountered this, and do any of the dev team know what that refers to? Thanks, can’t wait to get past this slight hurdle and play the game.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.