What's in your .vimrc file?
ilyak:   " menu for encoding
  set wildmenu
  set wcm=<Tab>
  set ts=4
  menu Encoding.koi8-r   :e ++enc=koi8-r<CR>
  menu Encoding.windows-1251 :e ++enc=cp1251<CR>
  menu Encoding.utf-8                :e ++enc=utf-8 <CR>
  map <F8> :emenu Encoding.<TAB>