[PyQt] trouble installing PyQt

[Kelie]

hello,

i installed PyQt v4 on winxp but i'm having problem using it. here is what i did:
installed MinGW-5.1.3.exe
installed qt-win-opensource-4.2.3-mingw.exe;
installed PyQt-gpl-4.2-Py2.5-Qt4.2.3.exe;

afterwards the PyQt Examples and Demos run fine. but when i typed
from PyQt4 import QtGui in python shell, got an error:
ImportError: DLL load failed: The specified module could not be found.

how do i fix it?  

thank you.