Where is the yafray registry key!! please help i cant render and my deadline is coming nearer?

plsss someone help me !!Where is the yafray registry key!! please help i cant render and my deadline is coming nearer?
Can you post the exact error on the Blender back console?





It may be you are simply using the wrong Render button. Yafray and Yaf(a)ray are different, and the Yaf(a)ray render button is accessed from the Yafray 003 Export Script, not the Blender Render panel(not F12).