I just bought and downloaded Beyond Divinity and have gotten several error messages. 1) d3dx9_25.dll is missing. 2) slash1.dll cant be opened. 3) configtool MFC application has stopped working.

Please let me know if/how I can fix this

Install DirectX 9c to fix the first and I think second errors. If you have a new install of Win 7/8, DirectX 9 is not included, and 10/11 are not backwards compatible, so you need to have both 9 and 11 installed.
http://www.microsoft.com/en-ca/download/details.aspx?id=34429

Alternately, it might help to re-install the game by running the setup as administrator (right click).

Try to execute the app with compatibility mode for windows xp sp3, this would fix the MFC crash.