No audio devices also no audio mixer message

Hello,
I installed windows xp over my windows vista and i couldnt get internet or sound to work, then i found my vista recovery disk i made(which i did not know doesnt put the operating system on it so now i cant get vista back) i then tryed installing drivers frm that disk and got my internet to work, no i cant get sound to work, i have tryed installing different drivers like the realtek driver i made sure in services-> windows audio it was set to automatic and started i dont know what to do does anyone know anything i can do, im thinking about trying that driver detective thing but i dont know if its a driver problem since i downloaded drivers and tryed them all, i dunno please help my computer depends on it...