can't source a file inside my _vimrc

[kib2]

Hi,

I had to change my os and I'm now under Vista.
I installed Vim 7 and copied my previous _vimrc. All my settings are 
good but one :

the python.vim script 
(http://www.vim.org/scripts/script.php?script_id=30) is supposed to 
build a menu, but I've got nothing instead.

I've putted this line in my _vimrc, as explained on the python.vim script :

au FileType python source C:\Program Files\vim\vim70\scripts\python.vim

without success.

Can you help me ?
Thanks.