readonly option is set add to ! override - Windows 8.1

Solution 1:

You need to open vimrc with write permission. In windows it probably would mean opening it as admin.
Also try to do what this message suggests - :w! instead of :w

Solution 2:

The vimrc you are editing is not your vimrc; it is a system-wide vimrc that you shouldn't edit at all. The correct location for your vimrc file and vimfiles directory on Windows 8 is:

  • any Vim version, 7.4 included:

    <root>\Users\<username>\vimfiles\
    <root>\Users\<username>\_vimrc
    
  • only 7.4 and up:

    <root>\Users\<username>\vimfiles\
    <root>\Users\<username>\vimfiles\vimrc