When I press the CTRL-Y key, it acts like the CTRL-R key. How do I

configure Vim to treat CTRL-Y as CTRL-Y? The mapping of the CTRL-Y key to the CTRL-R key is done by the mswin.vim script. The mswin.vim script maps CTRL-Y to make Vim behave like a standard MS-Windows application. This is explained in “:help CTRL-Y”. You can either comment out the line in mswin.vim that maps the CTRL-Y key or you can remove the line in your .vimrc file that sources the mswin.vim script.