All you need to do is to install latest CUDA SDK, no rename of any .dll for or anything (unless you trashed the system before).
Keep in mind that the CUDA SDK listed in the startup is _only_ the OpenCL driver which ships with your NVIDIA driver. The CUDA SDK also ships with the NVRTC library and hashcat also needs that one. The CUDA SDK is a separate package that you need to download from NVIDIA website and install on your system.