Probably you install xvid and then removed it, but for some reason it left some tracks behind it, so BSplayer found it in the available codecs..and when it tries to decode your videos it doesn't find that dll (since you uninstalled xvid)
Probably you need to clean your registry (there are many tools that can clean it for you, but if you don't really know what are you doing by using them don't do it, it may lead to system crashes)
Sorry if I'm wrong :P
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