If it says it can't find OpenCL.DLL...then that's why.
Please ensure you've installed your GPU's latest drivers. Then search your HD to see where OpenCL.DLL is installed. Make sure that the location is visible in your system PATHs directories (the driver installer should do this already but maybe another application changed it or something). If you have a stub OpenCL.DLL file (<100kb) in your max directory (installed by AMD ProRender, for example) make a backup of it and then try removing it.
Please ensure you've installed your GPU's latest drivers. Then search your HD to see where OpenCL.DLL is installed. Make sure that the location is visible in your system PATHs directories (the driver installer should do this already but maybe another application changed it or something). If you have a stub OpenCL.DLL file (<100kb) in your max directory (installed by AMD ProRender, for example) make a backup of it and then try removing it.