EDIT: Found the installation file, and Repaired when it said it was already installed. Seems to have fixed it well enough.
Been playing on this for month, no problem. OpenVR and Steam VR, no problem. Tried to load it up this afternoon, and got this error. Soft reboot and full shutdown of PC yielded no results. Task manager end process of everything Oculus related hasn't changed anything either. Please advise.