set of problem regarding movie editing Operating systems, Application Software, Syste

hi guys

i have movies which are taken by my n 95 n they are in mp4 format...now i wana edit them like cut some scenes and then add some effect to them like sound/video effect etc and them join them into 1 big clips


i wana know the best software for it but plz they should not be hi fi

1.i dont wana there resolution to be suffered due to conversion
2.i needa software which can cut and join them without affecting the original resolution of the clips


i cant be able to use window movie maker in xp as it didnt accept mp4