I found another workaround for this that's a little less drastic and probably easier for those who don't like messing with files.
Click the speaker icon in the tray at the bottom right of the screen. When the volume slider comes up there is a "mixer" button at the bottom of it. Click "Mixer". Now you will have a volume slider for the speakers, a volume slider for Windows sounds and assuming Hoster is open you'll have a slider for Hoster.
Click the Mute button below the Windows Sounds slider and it should silence the Windows Sounds without affecting anything else.
This is how it is setup and works on my computer, hopefully other folks will have similiar setups.
Sam
ADMIN NOTE: Good advice, but not the solution yet. Read on...
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