I have scanned it with AVG and Norton, it’s safe without any viruses and spyware.

Windows Media Player supports WMV video better than AVI video, you can use this Total Video Converter to convert your AVI video to WMV video for a try. You may also want to try installing ffdshow. It’s got all the latest codecs and doesn’t conflict with other software on your system. My favorite codec pack that works very well is K-Lite Codec Pack. However, sometimes installing a third-party codec pack will fix the issue. By default, Windows Media Player should be able to play AVI files without any codec pack. The other issue could be with the particular codec pack you are using. The issue here is that there are some files that may have become corrupted in Windows Media Player and therefore do not load AVI videos properly. If this has just starting happening to you in the last couple of days, the easiest way to get things back to normal is just to restore your computer to a point before the problem starting occurring.

If you have this problem, this step by step guide would help you fix it. Sometimes you may have this problem, you can’t play AVI video on Windows Media Player anymore, or you can play AVI video with only sound, no visual, but you could play it well yesterday or a few days ago.

Avs media player will not play video