Any fix for 5.1 sound at 24 bit 192,000 hz?

Hello all,

I've never been able to get 5.1 surround sound to work at 24 bits. Does anyone know how? 2.0 works at 24 bit. The sound quality is significant and this just sucks. Its been years and every nvidia update reminds me of it! I found this blog but the fix so far is to lower it to 16 bits.