For voodoo3 (3dfx) drivers look
here.
Further, in view of your PC's capacity, I think you've to many programs running at the same time and I also think you better go for a pre-1.0-version build of BSPlayer in combination with ffdshow. You already mentioned you tried an older version. Was that version 86 build 501 of 16-Sep-2003? If not, I would try that build. See
this post.