try use this freeware converter format factory
i've use this software alredi 2 years.
easy to use and satisfy wit format factory

Format Factory is a multifunctional media converter.
Provides functions below:
All to MP4/3GP/MPG/AVI/WMV/FLV/SWF.
All to MP3/WMA/AMR/OGG/AAC/WAV.
All to JPG/BMP/PNG/TIF/ICO/GIF/TGA.
Rip DVD to video file , Rip Music CD to audio file.
MP4 files support iPod/iPhone/PSP/BlackBerry format.
Supports RMVB,Watermark, AV Mux.

Format Factory's Feature:
1 support converting all popular video,audio,picture formats to others.
2 Repair damaged video and audio file.
3 Reducing Multimedia file size.
4 Support iphone,ipod multimedia file formats.
5 Picture converting supports Zoom,Rotate/Flip,tags.
6 DVD Ripper.
7 Supports 50 languages

OS requirements: All 32 windows OS

List of Version 2.20 changes

1 Added MIDI to MP3,WMA,and others.
2 Added more media muxing output types.
3 Added "Custom" output type to "Video Joiner".
4 Adjust Bitrate of "High quality and size" profile.
5 Improve the accuracy of media file splitting

WEBSITE GO HERE!!