BS Player turns black screen

I just bought a new computer which is running in Windows Vista and I have a BsPlayer installed on it. I love to watch videos so I have an .avi file and other for srt subtitles . That’s why I tried playing my video with it since I know that BsPlayer reads really well subtitles which are in srt format.
And now I am encountering a problem, for I am only seeing a black screen except for the audio, which is good and the subtitles that is perfectly showing on the screen.
Can somebody tell me what is happening? Do I have to download anything for me to be able to see the video properly?
