Hello,
Do you running WRobot in Windows Administrator session?
Make sure you start wow in 32-bit: https://us.battle.net/support/en/article/how-to-toggle-32bit-mode-world-of-warcraft
Install SlimDX: http://slimdx.googlecode.com/files/SlimDX%20Runtime%20.NET%204.0%20x86%20%28January%202012%29.msi
Update Framework: https://www.microsoft.com/fr-fr/download/details.aspx?id=48130
If the problem is not resolved, download No DX.cmd and move this file in your WRobot folder (where he has "WRobot.exe" file), and double click on it to launch WRobot.