Victor,

Go to Control Panel, Sounds list and make sure that ding.wav is assigned to the Default Beep. If it's not, select Default Beep and pick ding.wav from the dropdown list.
If above doesn't work, check http://webzila.com/articles/beep/

>Somehow within the last day of doing development (and assorted crashes) my
>Beep went away! The standard Beep in VB no longer produces a sound (ding.wav). All other sounds, alerts, etc., are still there.
>
>In an effort to track it down, I checked several API's to see what Windows
>says about it:
> The Beep function in kernal32 is silent; returns 1 for no errors.
> The MessageBeep function in user32 sounds all except for MB_OK; returns 1
>for no errors.
> The SystemParametersInfo in user32 says SPI_GETBEEP is true.
>
>There may now be an entry missing in the Control Panel Sounds list, but if
>it's gone, I don't know what it was. I browsed the registry for DING.WAV and
>found it in some odds and ends places, but nothing for a specific default
>sound. There's an EventsLabels under AppEvents for .Default that's named
>"Default sound", but no corresponding entry under Schemes for listing a file
>name.
>
>Did I lose a registry entry? If so, what should it be?
>
>Any help would be appreciated. My OS is Win98
>
>--Vic