Yellow box at the end of each line

Dear friends,
I am using vim-latex(http://vim-latex.sourceforge.net) and
fortran_codecomplete(http://www.vim.org/scripts/script.php?script_id=2487)

for my everyday use.
My vimrc is as follows:
$ cat .vimrc
set autoindent
set smartindent
set hlsearch
set incsearch
set ignorecase
set smartcase
set novisualbell
set paste
set ruler
set expandtab
set smarttab
set shiftwidth=3
set softtabstop=3
"set mouse=a "enable mouse
set nu "show line number
"set cul "highlight current line

if version >= 700
set spell spl=en_us
set nospell
nmap <F7> :set spell!
endif

" Fortran stuff
let fortran_do_enddo=1
let fortran_more_precise=1
let fortran_free_source=1

filetype on
filetype plugin on
filetype indent on

syntax enable

" Always jump to last edited line
if has("autocmd")
au BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$")
\| exe "normal! g'\"" | endif
endif

"let g:Imap_UsePlaceHolders = 0
set sw=2
set iskeyword+=:


The problem is, whenever I open a file with gvim, the last word of each
line is ^M. Though, it does not create any problem in compilation, its
odd and irritating to have a yellow box at each line.
is there anyway to do with this?

In my humble knowledge, this is caused by fortran codecomplete, but not
sure. The fileformat, checked using set ff? returns unix.

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