There are many video editing programs around that you can use, but if the things you listed are the only ones, you can simply do that with Microsoft MovieMaker. Simple and free of charge if you're on XP.
Don't expect fancy video editing from it, but you're obviously not interested in that.
Read this to avoid some of the pitfalls in MovieMaker: http://www.digitalvideoclub.com/tuto...ermistakes.php