'gvim' is not recognized as an internal or external command, operable program or batch file

i just recently installed ruby in rails from railsinstaller.org and
follow
the 2nd step on the video. Then, suddenly when i’m about to enter the
gvimon
*C:\Sites/railsinstaller_demo *i keep getting same error message.Hope
someone would help me

Do you have gvim installed?

If not then install it, otherwise it will be a path issue