.vimrc is the config file for Vim.  It can be stored in the Vim directory or in your user directory.  With greater protection of the Program Files directory on Vista, I've gotten into the habit of keeping it in my user directory (c:\users\steverowe on most systems).  here are most of the non-standard options I have in my .vimrc file.  Maybe you can pick up some pointers.

"set tabs to 4 spaces.
set tabstop=4
set expandtab
set shiftwidth=4

"automatically indent
set smartindent
set cindent

"case insensitive search
set ignorecase
set smartcase

"search the whole build tree for ctags
set tags=tags;/

"open the window larger than normal (100 wide by 40 tall)
win 100 40

set nocompatible
"allow for c,w to change part of a camel-cased word
source $HOME/camelcasemotion.vim

"make it so mouse and keyboard don't exit select mode."
"this makes it so we can select with the mouse and then act on that block."
set selectmode=""

"make long-line navigation work like other windows apps
map <DOWN> gj
map <UP> gk
imap <C-UP> gki
imap <C-DOWN> gji

"from here down is the default _vimrc
set nocompatible
source $VIMRUNTIME/vimrc_example.vim
source $VIMRUNTIME/mswin.vim
behave mswin

set diffexpr=MyDiff()
function MyDiff()
  let opt = '-a --binary '
  if &diffopt =~ 'icase' | let opt = opt . '-i ' | endif
  if &diffopt =~ 'iwhite' | let opt = opt . '-b ' | endif
  let arg1 = v:fname_in
  if arg1 =~ ' ' | let arg1 = '"' . arg1 . '"' | endif
  let arg2 = v:fname_new
  if arg2 =~ ' ' | let arg2 = '"' . arg2 . '"' | endif
  let arg3 = v:fname_out
  if arg3 =~ ' ' | let arg3 = '"' . arg3 . '"' | endif
  let eq = ''
  if $VIMRUNTIME =~ ' '
    if &sh =~ '\<cmd'
      let cmd = '""' . $VIMRUNTIME . '\diff"'
      let eq = '"'
    else
      let cmd = substitute($VIMRUNTIME, ' ', '" ', '') . '\diff"'
    endif
  else
    let cmd = $VIMRUNTIME . '\diff'
  endif
  silent execute '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' . arg3 . eq
endfunction