Fool
This is the properties of the sample you uploaded.
PIC_0076.AVI,
4.2 mB, no subtitles , XviD MPEG4 Codec, 320x240 pixels,
00:00:00:51 sec., 30.00 (30.0003) frames per sec.,
Microsoft ADPCM Format, 130 kbit, 16000 Hz, 2 chan
Make sure when you convert that you use the correct audio format.
Download this video clip and let me know if it works in your player.
(It will not be full screen for you)
http://uploaded.to/?id=y96npv
Dave