Having RealMedia Splitter on this list, or your codecs/filters are completly messed up either your file is not an AVI but an RM (or RMVB) file.
In the first case, you should uninstall all codecs you have instaled (or codec-packs) and re-install them through codecmanager.exe.
In the second case, you should install ffdshow and in it's audio configuration you need to enable support for real media audio.
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