Find a great free (donations requested) audio converter at

http://www.mediacoderhq.com/

I tested it, works without any problems

MediaCoder is a free universal batch media transcoder, which nicely integrates most popular audio/video codecs and tools into an all-in-one solution. With a flexible and extendable architecture, new codecs and tools are added in constantly as well as supports for new devices. MediaCoder intends to be the swiss army knife for media transcoding in all time. Millions of people are using the software all over the world.

Features In Brief

• Converting to between most popular audio and video formats in batch
• Multi-threading design, optimized for multi-core processors (average CPU utilization on quad-core processors over 90%)
• Full control over transcoding parameters
• Simplified UI for popular mobile devices (e.g. PSP, iPhone/iPod)
• Fully standalone, no dependancy on system codecs/splitters
• Media Transcoding Platform to expand UI and improve user experience

Typical Applications

• Improving compression / reducing size for audio/video files
• Converting for audio/video playback devices (digital audio player, MP4 player, mobile phone, PDA, PSP, VCD/DVD player etc.)
• Extracting audio tracks from video files
• Ripping audio/video discs
• Reparing corrupted or partial downloaded video files

• Supported Fomats MP3, Vorbis, AAC, AAC+/HE-AAC, AAC+v2/HE-AAC v2, MusePack, Speex, AMR, WMA, RealAudio, mp3PRO* FLAC, WavPack, Monkey's Audio, OptimFrog, AAC Lossless, TTA, WAV/PCM, Waveform H.264, XviD, DivX, MPEG 1/2/4, Theora, Flash Video, Dirac, 3ivx*, RealVideo*, Windows Media Video AVI, MPEG/VOB, Matroska, MP4, PMP, RealMedia*, ASF, Quicktime*, OGM* CD, DVD, VCD, SVCD, CUESheet*, HTTP*, FTP*, RTSP*, UDP* * supported as input only