No sound in my pc

hi..
when the system boots, it shows error msg "No SPD found on DIMM 2"
there r no start up, log out, error sounds etc..
In the control panel/sound and audio properties window, the volume slider etc. are disabled.
i tried updating the driver using motherboard cd, but the "Realtek software install option" which was visible previously, is now not available.

how can i fix this?
please help me