$registry.dll

Hello. I am attempting to use this dll to delete the value of a registry entry but I fear it may be one of the blocked areas of the registry.. what I am trying to do is this:

echo -s registry: $dll(registry.dll,DeleteValue,HKEY_CLASSES_ROOT\CLSID\{7a32634b-029c-4836-a023-528983982a49}\\{5954F421-4768-46bc-B331-3DC37B1E7048})

If anyone knows another way to delete the value of a key (perhaps with DDE) please let me know.

thanks