morgan stream switcher is completely unimportant for use with bsplayer: its only purpose is to allow playback of avis with more than one audio stream.
BsPlayer does that natively => you don't need mmswitch.ax
either you want to keep it anyway => you should upgrade it
http://www.morgan-multimedia.com/mmswitch/
or you don't want to keep it and you should unregister it from your system:
start-->run
Quote:
regsvr32.exe -u mmswitch.ax
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if the mmswitch.ax file is not in your %windir%\system32 directory, you'll have to provide the full path to mmswitch.ax in this previous command line