Problem with new Vista and os.system

[Arne Jamtgaard]

I'm getting myself set up on a new Vista box at work, and one of my
old scripts has stopped working.

Specifically, all calls to os.system return a -1.  Whatever action I
was
asking os.system to run does not take place.

Is this a Vista thing, or perhaps just a wonky setting in my
environment?
I've installed the latest python (2.5) within the past two weeks...

I've double-checked other functions for os.* and they seem to work
from
the python command line - it's just os.system.

Arne