how do I set a Python installation as the default under windows?

[Stef Mientki]

hello,

I just upgraded from Python 2.5 to 2.6.
Most of the things work,
but I'm struggling with one issue,
when I start Python in a command window,
it still uses Python 2.5.

Is there a way to get Python 2.6 as my default Python environment ?

thanks,
Stef Mientki