How to take omni-complete operation effect in Windows using vim73

I am using vim in Windows system.
but I meet a omni-complete problem that it can only list 7 words automatically when vim 1.pl and then pressing <C-X><C-O> in windows,
However, it can list 203 words when vim 1.pl and then pressing <C-X><C-O> in Linux,
_vimrc part setting is shown as below:
set nocp
filetype plugin on
set ofu=syntaxcomplete#Complete
imap <silent> ` <C-X><C-O>


some detail description can be visist http://bbs.chinaunix.net/thread-4132366-1-1.html.

Is anybody familiar with vim setting in windows?
Any help and solution will be appreciated.
Thanks advance firstly.

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