DLL NOT FOUND EXCEPTION even after following procedure

Hello Guys, I have a Game in Unity3d that uses VRPNWrapper.dll to stream the values from a 3D motion sensor. The application was working very well in my PC as well as a laptop. I got a new laptop and the application gives an error DLLNOTFOUNDEXCPETION. I have checked the following things and it is still not working 1) The path of DLL is correct in the program. It is C:\VRPNWRAPER\VRPNWRAPER 2) It is working very well in other PC;s or laptops so I installed Visual Express C++ and Visual Express C# 3) I have also used dependency walker or CFF explorer to check if any other DLL's are missing. I found a few DLLs missing that I downloaded from internet n copied to windows. The DLLs are not missing anymore.