Try Leawo FREE AVI converter which can convert videos in many formats to AVI. It's totally clean and free. The output AVI video can be edit in windows movie maker, and playback on some partable devices. it can accept WMV, AVI, MPG, 3GP, MPEG, RMVB, RM, RA, MOV, QT, MP4, M4V, DV, DAT, MP3, WMA, AAC, etc.
then output with these format AVI, MP3, AAC, WAV, M4A, etc. you can download this Leawo FREE AVI converter here ------------------------
For windows: http://search.yahoo.com/search;_ylt=A0oGkzjmNYVKPBMBmadXNyoA?p=leawo+free+avi+converter&y=Search&fr=yfp-t-151&fr2=sb-top&sao=0
For mac: http://search.yahoo.com/search;_ylt=A0oGkj_8NYVK5k0A8S5XNyoA?p=leawo+mac+avi+converter&y=Search&fr=yfp-t-151&fr2=sb-top&sao=0
wish help and good luck.