I have tried various display drivers (169.21 (from Nvidia), 169.62 and 174.93 (from laptopvideo2go)) but the sample codes in “C:\Program Files\NVIDIA Corporation\NVIDIA CUDA SDK\bin” still fail to run in release or debug mode. However, it runs fine in emuRelease (since it is actually running on the host). Does this imply that the display driver does not work with my graphics card or is it because my low end graphics card (Geforce 8400M G) is not capable of running simple examples like the SobelFilter, Matrix Multiplication and BoxFilter? For your information, I have installed the display driver (with modded inf for notebooks), toolkit and sdk accordingly without any errors and I can even compile the sample source codes without any problems. Appreciate anyone who can assist me. Thanks in advance!