Getting "Conversion Failed" errors again

Have you tried using 353.9?

Win 7/8.1 - http://developer.download.nvidia.com/compute/cuda/7.5/Prod/local_installers/cuda_7.5.18_windows.exe
Win 10 - http://developer.download.nvidia.com/compute/cuda/7.5/Prod/local_installers/cuda_7.5.18_win10.exe

OR

376.51