How to load current buffer into interpreter in emacs?

[cnb]

I'm trying to switch to using emacs for python.

The interpreter and python-mode works but I can't load the file I'm
editing into the interpreter.

im not sure if c-c c-l is supposed to do that but it complains "no
module xxxx" .

what needs to be in my emacs-path?

what needs to be in my windows path?

I have c:/python25. adding that tot he path ads everything inside
python25? i have my programs in:
c:/python25/progs/
in which i have /progdir/someprog.py for example