I've successfully created a standalone version of my Python 3.3 program with cx_Freeze 4.3.1 and it works perfectly on one PC but raises an error on another. The last line of the error says:
File "ExtensionLoader_PyQt5_QtWidgets.py", line 11, in <module>
ImportError: DLL load failed: The specified module could not be found.
Both PCs do not have Python installed and are running 64bit Windows 7, so I really don't know what could cause the error.
Solution: With the Dependency Walker I could determine that the missing DLL was "D3DCompiler_43.dll". So a DirectX Update should solve the error.