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well adobe premiere is a sweet program that is nearly as good as final cut and works on pc's. after effects is more for...well after effects so you probably wouldnt make an entire edit using that. this all costs a buttload though so id go ahead and use torrents to get it for free (plenty of threads on how to)
as for the slow motion, it might be that you're shooting in progressive rather than interlaced, but if not then i have no clue!