I'll perform the steps to diagnose the crash through the forum you suggested. For sure.
Quick question/comment about DX10 Preview. When you say to test DX10 Preview working on the system, do you mean running FSX with the DX10 Preview button checked? If so, then yes, I've been running FSX with the DX10 Preview button checked with no problems.
Heading to the CTD forums now! Thanks again. (By the way, to be clear, I'm not frustrated with you or your product at all!)