If and when a complete problem report, including the standard PC Gaming Computer hardware component summary, and a routine software environmental description is provided, along with full symptom details, then perhaps someone here will be able to offer a suggestion. Sorry to have nothing else for you now.
http://www.gamesas.com/index.php?/topic/1123068-what-that-dxdiag-thing-includes/
http://www.gamesas.com/index.php?/topic/1144076-some-trouble-shooting-assistance/