windows上 用vundle 来安装插件，已经安装配置了 vundle， 执行 :PluginInstall 时 提示 不是编辑器命令

set nocompatible              " be iMproved, required
filetype off                  " required

" set the runtime path to include Vundle and initialize
set rtp+=~/vimfiles/bundle/Vundle.vim
call vundle#begin()
" alternatively, pass a path where Vundle should install plugins
"call vundle#begin('~/some/path/here')

" let Vundle manage Vundle, required
Plugin 'gmarik/Vundle.vim'

" The following are examples of different formats supported.
" Keep Plugin commands between vundle#begin/end.
" plugin on GitHub repo

" All of your Plugins must be added before the following line

Plugin 'git://github.com/scrooloose/nerdtree.git'
Plugin 'git://github.com/scrooloose/nerdtree.git'

call vundle#end()            " required
filetype plugin indent on    " required