Dell XPS 15, Sound Blaster X-Fi missing

Hello, I own a Dell XPS 15(L502X) and I just upgraded to Windows 8 and I found out my Dell audio has been missing. Luckily I was able to download it back. But this time I found out that the Sound Blaster X-Fi is missing. Others are just fine ( I mean the Dell audio by Realtek).

Can anyone help out?

Thanks in advance.