Mudbox cannot start after the installation of program

Hello there,
I just installed Mudbox on my PC and when I tried to open the program this error appeared and closed the process. The installer was not corrupt and is compatible with my Windows 7. Any solution ? What this entry point means and what is causing this ?
Thanks !

mudbox.exe – Entry Point Not Found
The procedure entry point???1QGLWidget@ueaa@xz could not be located in the dynamic link QtOpenGL4.dll.
