You can use any of these Video Converters. They are all FREE.
Koyote Free Video Converter : http://koyote-free-video-converter.en.softonic.com/
Koyote Free Video Converter is one of the most complete programs to convert your videos under numerous formats. Simple and easy to use, it allows easily to extract videos from sequences and accomplishes conversion with pre-visualization.
Supports large range of formats like AVI, MP4, iPod, PSP, 3GP (mobile phone format), Zune, iPhone, FLV, MKV, WMV, ASF, MOV, etc...You can choose to convert only some parts of your videos. It allows to set the Start Time, end time or duration that you wan to extract. You can choose to only extract the sound of your video into MP3, WMA, MP2..etc.
Import: AVI, DIVX, MOV, MP4, FLV, 3GP, WMV, ASF, MKV, VOB, MPEG, MPG, M1V
Export: 3G2, 3GP, ASF, MP3, AVI, DVD, FLV, MP4 (iPod, iPhone, PSP, Zune), MPEG1, MPEG2, WMV
Any video Converter : http://www.any-video-converter.com/products/for_video_free/
Any Video Converter Freeware is the most renowned free video converter for converting video files between various formats, with fast converting speed and excellent video quality. It can clip any segments and optionally merge and sort them to make a creative movie. And even more, Any Video Converter Freeware can crop frame size to remove any unwanted area in the frame just like a pair of smart scissors.
Input formats: avi, asf, mov, rm, rmvb, flv, mkv, mpg, 3gp, m4v, vob, YouTube videos and more
Output formats: avi, mp4, wmv, swf, flv, mkv, MPEG-1 and MPEG-2, mpg (PAL or NTSC), mp3, wma, ogg, aac, wave, m4a
Free Zune Video Converter : http://www.zunescene.com/free-zune-video-converter/
Free Zune Video Converter enables you to convert popular video formats (AVI, MPEG, MP4, FLV, MOV and others) to Microsoft Zune compatible video format (WMV, MP4, M4V, MOV). You can customize the video output parameters, including audio and video bitrate, fps, resolution, sampling frequency and more. In addition to video conversion the program can also extract audio tracks from video files to MP3, WMA, M4A or AAC format.