When you reinstall Windows XP, it frequently does not retain all hardware drivers. It's your responsibility to reload them. If you have a "Resources CD" that came with your CD, you can normally install them from there. If you have a brand name computer, try going to the manufacturer's website and checking for updated sound drivers for your particular sound card and model. If that's not available, then visit the sound card manufacturer's site and download and install from there.
Determine you sound card manufacturer by RIGHT clicking on "My Computer", choose "Properties", choose the "Hardware" tab, choose the "Device Manager" button, then click on the + sign beside the "Sound, Video, and Game Controllers" listing. Find the sound card listing, RIGHT click on it, choose "Properties", then check the "Driver" tab.
Hope this helps.
i re loaded windows xp and now i have no sound the Sndvol32.exe or sound control is not working what do i do to fix it ?