Sound: Audacity
Video: there's a bunch that vary in complexity depending on what exactly you want to do and with what file types. Machete Lite is a good free basic editor that can cut out segments of video files, but it only works on WMV and AVI. Hard to answer your question without more details about what you need to do and on what type of files. For instance, do you want to change brightness and contrast or do you just want to chop out certain portions? Do you want to overdub the audio portion of a video file? Do you want to change the file format? Etc, etc.
Sound: Audacity
Video: there's a bunch that vary in complexity depending on what exactly you want to do and with what file types. Machete Lite is a good free basic editor that can cut out segments of video files, but it only works on WMV and AVI. Hard to answer your question without more details about what you need to do and on what type of files. For instance, do you want to change brightness and contrast or do you just want to chop out certain portions? Do you want to overdub the audio portion of a video file? Do you want to change the file format? Etc, etc.
Basically I wanted a program that would let me take somthing like a Tv show and like you said edit certain parts and overdub the audio and cut out certain parts add stutter loops,fast fowarding and sentence mixing for example