Visual Basic - Registro

Vereis tengo un programa que registra en un determinado lugar unos valores de mi programa, en otro momento necesito borrar todos esos valores, con el código que esta a continuación, borro solo uno de esos valores:
error = RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\IGM", 0, KEY_EXECUTE, IDCLAVE)
error = RegDeleteValue(IDCLAVE, "C")
error = RegCloseKey(IDCLAVE)
Pues bien con el RegDeleteValue borro el contenido del valor "C" quiero borrar la Subclave completa denominada "IGM" que se encuentra dentro de la clave " HKEY_LOCAL_MACHINE, "Software"
Espero haberme esplicado bien.
Un Saludo

Const KEY_QUERY_VALUE = &H1
Const KEY_SET_VALUE = &H2
Const KEY_READ = ((STANDARD_RIGHTS_READ Or KEY_QUERY_VALUE Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY) And (Not SYNCHRONIZE))
Const KEY_WRITE = ((STANDARD_RIGHTS_WRITE Or KEY_SET_VALUE Or KEY_CREATE_SUB_KEY) And (Not SYNCHRONIZE))
Const KEY_EXECUTE = (KEY_READ)
Const KEY_ALL_ACCESS = ((STANDARD_RIGHTS_ALL Or KEY_QUERY_VALUE Or KEY_SET_VALUE Or KEY_CREATE_SUB_KEY Or KEY_ENUMERATE_SUB_KEYS Or KEY_NOTIFY Or KEY_CREATE_LINK) And (Not SYNCHRONIZE))
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Private Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal lpSubKey As String) As Long
Private Declare Function RegCreateKeyEx Lib "advapi32.dll" Alias "RegCreateKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal Reserved As Long, ByVal lpClass As String, ByVal dwOptions As Long, ByVal samDesired As Long, lpSecurityAttributes As Any, phkResult As Long, lpdwDisposition As Long) As Long
Private Declare Function RegOpenKeyEx Lib "advapi32.dll" Alias "RegOpenKeyExA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal Reserved As Long, ByVal samDesired As Long, phkResult As Long) As Long
Private Sub Form_Load()
'KPD-Team 2000
'URL: http://www.allapi.net/
'E-Mail: [email protected]
Dim Result As Long
'Check if the specified key exists
RegOpenKeyEx HKEY_CURRENT_USER, "KPD-Team", 0, KEY_ALL_ACCESS, Result
'If the key doesn't exist, we create it
If Result = 0 Then
'Create a new key%0