converting 30 to 60 fps using a laptop

currently using a commercial Panasonic ag- 7250 vhs player- recorder to split the 30 fps film I am copying on a vhs tape from a dvd (player) to playback using the jog shuttle function so I can frame by frame or slow motion at a rate of 60 fps it copies on the vhs tape....my 7250 needs replaced and want a software program so I can download these 30 fps dvd movies on my laptop that will allow me to play them back (frame by frame or in slow motion) at 60 fps.