First off sound is not installed, the driver or abstraction to use your sound hardware is what is missing.
Sndvol32.exe is a file located on your Windows CD, which can be extracted instead of installing the whole things again, or possible attatched to the media components if you wish to uninstall and install them again.
You will need a Windows CD to do this, why you don't have one i won't venture to guess. Buy, borrow, or what have you, but you're gonna need a copy.
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