If you install the NT Resource Kit, it comes with some sample of WSH
One of them shows how to delete registry keys.

>Hi All!
>
>I'm using the Registry.PRG (written by Randy Brown) that is provided with VFP5, but there doesn't seem to be a method to delete a value (not a key) from the registry.
>
>I can find DECLARE Integer RegDeleteValue in the LoadRegFuncs method, but that API call isn't used anywhere, and I haven't had much luck in using it.
>
>Any hints? Thanks!