Lets try something from a different angle:
Start/Control Panel/System/Hardware tab/Device Manager
Now scroll down to "Sounds, video and game controllers", is there a
Yellow question mark on it? If yes, it means it is not installed. Go to:
Start/Control Panel/Sounds,...etc./Hardware tab/Properties button/Driver tab
Update driver - now have your Utility, Sound driver or Maintenance disk ready to
insert. It should have come with your PC when you bought it. Check for one
that may have drivers for the soundcard. It may also have SoundBlaster on it.