Can anyone help me, please.. I'm a windows 7 (x64) user and i got this message when i try to convert my .ui file to .py Traceback (most recent call last): File "C:\Python26\Lib\site-packages\PyQt4\uic\pyuic.py", line 4, in <module> from PyQt4 import QtCore ImportError: DLL load failed: %1 is not a valid Win32 application. Thanks