PYTHONPATH and PATH system variables

Question

I am working with quantum gis 1.7.2.During installation it creates python25 folder. I am working with python2.6 for python plugins for QGIS. i set system variable as:

PATH :=C:\Program Files\Quantum GIS Wroclaw\apps\qgis
     C:\Python26\Lib\site-packages\PyQt4\bin 
PYTHONPATH:=C:\Program Files\Quantum GIS Wroclaw\apps\qgis\python;

ErrorMessage

Traceback (most recent call last):
File "C:\rt_sql_layer_working\DlgQueryBuilder.py", line 30, in <module>
from qgis.core import *

ImportError: DLL load failed: The specified module could not be found.

is this because of version mismatch or paths are wrong??