No sound.
Exclamation sign(!) on Multimedia Audio Controller at Device Manager
Install the sound driver. Your system is VERY old - SiS530 & only 128MB RAM? You shouldn't even be running XP on it. If you don't have the drivers for it, try the mother manufacturer's website. If there are no XP drivers, try Win2000 drivers.
If it's a soundcard an not on-board sound it'll probably be easier to get a new(er) card with XP support. I couldn't find XP drivers for that chipset.