HP Pavilion Laptop dv5120eu Sound drivers missing, no Sound on Laptop

I have recently installed Vista home premium 64 bit on my HP Pavilion dv5120eu Laptop. I did not had any issue in installing Vista but Sound driver is missing. I have gone through device manager and i see Multimedia Audio Controller with yellow exclamation mark. I have tried searching for the driver but i haven't found it anywhere. Can anyone point me to a site from where i can download it???

You should have checked on hp official site, anyways i have found it here but its for Microsoft Windows Vista Operating Systems (32-bit). I will suggest you to better contact HP Tech Support and check out what they have to say about it??