The program to allow you to edit videos and make them slow-mo is call Premiere Pro, preferably CS5. You can use it with OnLocation to allow you to tether video shoots to your computer. Furthermore, you can use it to import from your camcorder.
To make slow-mo, simply right on video clip in the timeline and go to duration/playback speed and set to your liking.
Good luck. PS and Lightroom, along with all other Adobe CSes are available for download as trials on your PC. Check their site.