How can I update 'wherever PATH info is stored' ?

Greetings;
>From BOA, When I try to RUN the "XRCed-02.py" and "XRCed-02.xrc" files, I get the following 
msg:  
BoaError Execution command "C:\Program Files\Python26\python.exe"XRCed.02.py 
'failed (error 2: the system cannot find the file specified.) 

Please, How can I update 'wherever this PATH info is stored' to look here instead: 

C:\Python\Lib\site-packages\Boa Constructor\Practice 

My current Envorinment Variables say: 
PYTHON C:\Python

PYTHONPATH 

C:\Python\Lib\site-packages\wx-2.8-msw-unicode\wxPython;C:\Python\Lib\site-package

s\Boa Constructor\Practice
   

ô¿ô
 V  e  r  n   

WinXp sp2 ,  wxPython2.8-win32-unicode-2.8.9.1-py26.exe , Boa 0.6.1,  Delphi5 
http://www.flickr.com/photos/vmars956/

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