Presario C 700 No Audio Device installed for Vista business 32bit

Good day..

I've downloaded all the drivers for my Compaq Presario C700 and i've tried it  C700 CTO all the way down to C700XX yet still the Audio Driver is not present and my laptop was not having sound. Im using Compaq Presario C700 (C791TU)  The serial number is {Personal Information Removed} and  P/N  FF390PA#UUF.

I was using Microsoft XP Professional SP3 before and my hard drive dies; yet lost my driver/OS installer for xp. so i bought a new HDD and changed to Microsoft Windows Vista Business. since then i had only no audio drivers for my new vista 32bit.  :smileysad: Please help.