I\'ve added a reference to the CUDAfy.NET library via NuGet.
This may also happen if you had at some point installed CUDA Toolkit v7.5, but realized that the most recent version of CUDAfy supports CUDA 7.0. On uninstalling CUDA 7.5 from the control panel, some files/folders may still remain. You should delete these manually. You may use CUDAfyViewer to see which version of CUDA Toolkit is being accessed.