You have to conform the 60p/60i to 25p/25i when you ingest the footage into your application and/or you have to put the footage on a timeline configured to play at 25fps.
If you do this, your footage will play at 25fps rather than 60fps (i.e. about half speed with no loss of smoothness). Google 'conform footage <your editing application>' to see how to do this if you are unsure.
If you later want to advance to ultra slow footage (e.g. x10 slower), you have to use a plugin that creates in-between frames from your existing frames ('synthetic-tweening'). I use twixtor for this, and to use it successfully with the A765/77, shoot at 50p/60p with as high a shutter as possible (over 1/1000s, so you need very good light). Again, Google is your friend.
Video can be very tricky when you first come to it from stills, because frame rate is often an alien concept (with all sorts of little nuances that are easy to miss!). Anyway, hope that helps.