After installing the Python.msi x86 installer on an Intel P4 machine 
running Windows XP SP2, I am getting the error "Subprocess startup 
error" and when i click OK on the dialog box the Python IDLE closes. I 
do not have Microsoft Visual Studio installed on my system but do have 
the .NET framework 1.1 installed. The reason code in the pop up says 
either the IDLE cannot start a subprocess or a firewall is blocking the 
connection. Is it necessary that the anitvirus/firewall software needs 
to be disabled before installing Python 3.0 or is it the case as 
mentioned in the http://www.python.org/download/releases/3.0/ "Read 
this first" section i.e. python30.dll cannot be installed in system32 
folder?

One more thing i am already running Python 2.5.2 and concurrently 
installed Python 3.0 a without uninstalling the 2.5.2.

IDLE works in a server/client configuration with itself. Most probably
the firewall is blocking IDLE's connections.

Best way to try this is full disabling the firewall, and trying. 

If it works, remember to activate the firewall back, and configure it
properly to work with IDLE.

hi,
thanks so much for the clarification but i never faced this problem
with 2.5.2. This is the only instance of pyhton that causes the
mentioned error.

On 2/26/08, Facundo Batista <report@bugs.python.org> wrote:
>
> Facundo Batista added the comment:
>
> IDLE works in a server/client configuration with itself. Most probably
> the firewall is blocking IDLE's connections.
>
> Best way to try this is full disabling the firewall, and trying.
>
> If it works, remember to activate the firewall back, and configure it
> properly to work with IDLE.
>
> ----------
> nosy: +facundobatista
> resolution:  -> works for me
> status: open -> closed
>
> __________________________________
> Tracker <report@bugs.python.org>
> <http://bugs.python.org/issue2191>
> __________________________________
>