Assuming that you also obtainbed BSPlayer from this pack, you're using BSplayer's version 0.86.501 now. (Look if the "about" information indeed mentioned build 501).
Right-click on BSPlayer and select "Options"/"Preferences" and then "Video"-tab.
Check (select) "Use DivX 4 decoder fgor MP43, DIV3, DIV4"
Now try (e.g.) "Use overlay" Mode 1.
If it doesn't work try different overlay settings (incl. "Use VMR-9)"
General advice and warning re the use of codec packs:
In most situations, you do not need to install codec/filter packs and certainly not every codec/filter that comes with these packs. In fact,
you may run into problems if you install too many codec/filters on your computer. It is
highly recommended that you only install the codec/filters that you absolutely need.