Sound/ audio

Hello,
my computer is a windows xp. i think classic.
the problem is that:
my computer doesn't have any sound.
whenever i try to fix it, i go to volume controls but they say:' There are no audio mixer devices available. To install mixer devices, Go to Control Panel, click printers and other hardware then click add hardware. this program will now close'.
i tried everything. i went to control panel, Sound,speech And Audio Devices but when i click sound and audio devices, everything is greyed out.

Please help!!!