I have no idea where to put this is I will post it here, I have compiled and run my game on my computer and then took it around to many others without fail but when I got to my school (yes I got permission to do this) I put it in and it said it found no D3D device....soooo:

1) What is a D3D device?
2) How can I get one in a folder for my published game so that it works on my school's computers (assuming this is software, not hardware)?
3) If 2) is irrelevant then how do I get my software simply to run by fixing or bypassing this problem?