Comment 12 for bug 315996

in that case, it would be worthwhile to go back to the path setup:
either the path C:\Program Files\Inkscape\python\
or the path C:\Python25\
should be declared in the path command.
In either case, it should be possible to go into any directory anywhere, and type in the word "python" and have it execute normally.
It should also be possible to go into the directory C:\Program Files\Inkscape\share\extensions\ and type in the command :
python webbrowser_faq.py (or whatever the name of the appropriate .py file is)
and have it execute as well. I normally define the path in the \autoexec.bat file, but there are other ways of doing this, depending on your preference.