Vista: webbrowser module

[Norman Lorrain]

I don't have a Vista machine to test this on, but I have users 
reporting a problem with the following

e.g.
import webbrowser
webbrowser.open('http://www.google.com')


File "webbrowser.pyc", line 43, in open

  File "webbrowser.pyc", line 250, in open

exceptions.WindowsError:[Errno 2] The system cannot find the file specified:


Works on XP, OSX, Ubuntu.  I find no reference to this problem.  Is 
there a work-around?

Thanks.