I am a windows user and it is a pain in the *** to install this. So I would like to share my setup to make it easy for others.
I gathered all files needed and put them in a single folder.
All you have to do is download KicadBOM.zip (1.2 MB), unpack, place the folder on your harddrive and add the path to the PATH variable in windows.
Read the readme.txt for more info.
This includes the standard BOM script and the one from this post.