I have a young lady friend who has an older Nancy Drew game available which played OK on W7 but the newer game aborted with a directx error. I noticed that the directory structure between the installed games was identical and got an idea. The following is NOT recommended for a novice.
Both games work just fine on my Pentium and Windows 7 Home Premium. Contacted Support about a week ago and still no reply. So, it seems to be a physical issue.