If your CPU indeed is a Pentium III 392MHz I would advise you to perhaps use Version 0.86 Build 501 (of 16-09-2003) in combination with ffdshow.
You can download version .86 build 501
here (501 available as zip and/or as exe=install file),
here (501=zip-file) or
here (501=zip-file)
[
Note: though these sites also have version 1.0 build(s) on them, I would advise anyone who wishes to use BSPlayer's version 1.0 (also to make sure you indeed have the latest build), to download it from the site of its creator
bst, i.e.
here.]
You can download ffdshow (alpha)
here, or you can use the link as provided at the bottom of
adicoto's list of codecs
(
http://forum.bsplayer.org/viewtopic.php?p=12912#12912 )