Worked until Widows Re-install

[Curiousity]

I have reviewed this forum, but have not found an answer to the problem that I have. Prior to my re-installation of Windows 98 with formatting, I was running BSplayer without any hitches. I was able to view all movies with Nimoc Codec (AC3, Intervideo), Divx Bundle 5.03, and Xvid codec. Since the re-installation, I can't play most of the movies and BSplayer will not start. It will give "Bplay" when I look to see if it is running in the background. There has to be some file missing that I had prior to my re-installation that allow me to play all the files, but what is it? Any guesses?