I agree with BC here, A missing driver seems to be what's causing the issue here.
Open Device Manager by clicking the Start button, clicking Control Panel, clicking System and Maintenance, and then clicking Device Manager.
Once in there, are there and devices with a yellow triangle or red X on top of any hardware icon?
Is it possible just the internal speakers are damaged only? Can you plug headphones/speakers into the laptop to get sound?
Otherwise, if you are quite sure there is no way you can get sound out of it, there are some cheaper USB sound cards out there for the general home user. most of them just provide a speaker out, and mic in, and are about the same size as a largeish flash drive.