please check which version of drivers you have installed(X64 or x86). If you have installed 32 bit(x86) version of drivers you have to be sure that you are forcing your application to run on x86 CPU in build configuration.any CPU will by default run on 64 bit mode and if you have installed 32 bit version of drivers it will not work.

Same applies Vice versa. if you have installed 64 bit version of drivers and you are running your app in x86 CPU build configuration will not work eather.