One very good video editing software that is freely available is Video Edit Master. The easy to use interface provides a variety of features such as joining together two different videos that have the same encodings, frame rate and resolution. At the same time, there is no need to have to re-encode the video. Video Edit Master is extremely useful in cutting out commercials that are present in any MPEG or AVI files and can also be used in the capturing of individual frames from different videos. At the same time, there is also a very useful and friendly GUI interface that can be used to preview movies.
download free Video Edit Master (from CNet)