Installed Vista: Lost Sound

i installed vista home basic on ma laptop, now my sound is lost, i have tried downloading from sigmatel to realtek to no avail. i was on winxp pro, now I'm kind of frustrated and actually regrettinh installing the os even tough i love the user interface and all the efizee attached to it, i use a dell d600, abeg make una help me with suggestions or does anyone have sigmatel audio drivers that run on vista? bigbrovar are u there?

A missing driver problem.

hayprof has said it all - Microsoft Update on the basis that ur OS is genuine.