Obviously , your video needs xvid codec to play , and your windows dose not has one . see following screen:

Yes , if you are luck , you can hear the sound , but no video .
FFDShow is DirectShow decoding filter for decompressing DivX, XviD, H.264, FLV1, WMV, MPEG-1 and MPEG-2, MPEG-4 movies codes . It is free and can be download from
http://www.free-codecs.com/download/ffdshow.htm
(it this link dose not work , please try FFDShow on goolge.com)
Please note that , you need directx9 or later installed before you can install FFDShow, or it won't work . So the steps are:
1) . If you don't have directx9 or later in your system , download it from :
http://download.microsoft.com/download/8/1/e/81ed90eb-dd87-4a23-aedc-298a9603b4e4/directx_9c_redist.exe
2) . Install directX 9
3) . Install FFDShow codecs package .
step 2 must before step 3 , or the codecs dose not work.