Buffer underflow

Hiya, I'm sorry to hear this is happening! Would it be possible to take a screenshot of the error?

Secondly, please provide a DxDiag so we can learn a little more about your computer. You can do this by opening the start menu, searching for "dxdiag" and running "dxdiag.exe". Then click "Save all Information" and then paste the text in a spoiler tag here.