[IronPython] System.Windows error no module named Windows

[luke14free]

Hello,
I'm a newbuy of Iron Python, I've just installed it and wanted to see 
how it was. After a few common problems I've tried to run via execfile() 
tutorial\\calculator.py
However I get an error:
No module named windows
Even after I've done:

import clr

clr.AddReference("System.Xml")

from System.Xml import *

dir()

I've Visual Studio 2005 and 2008 on my pc. Any hint?
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