Enumerate Registry hive and subkeys?

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VB

Hello I am aware that the registry class exists for vb.net but am a bit confused as to how its possible to enumerate all levels to a label or textbox in succession one key after another like a virus scanner iterating over a filesystem.

I have been trying to use this bit of code that I have found can anyone shed a bit of knowledge on this?

Public Function GetAllChildSubKeys(ByVal MainKey As RegistryKey, ByVal sKey As String) As ArrayList
       Dim rkKey As RegistryKey    'RegistryKey to work with
       Dim sSubKeys() As String    'string array to hold the subkeys
       Dim arySubKeys As New ArrayList 'arraylist to return the subkeys in an array
       Try
           'open the given subkey
           rkKey = MainKey.OpenSubKey(sKey)
           'check to see if the subkey exists
           If Not sKey Is Nothing Then 'subkey exists
               'get all the child subkeys
               sSubKeys = rkKey.GetSubKeyNames
               'loop through all the child subkeys
               For Each s As String In sSubKeys
                   'add them to the arraylist
                   arySubKeys.Add(s)
               Next
           Else    'subkey doesnt exist
               'throw an exception
               Throw New Exception("The SubKey provided doesn't exist. Please check your entry and try again.")
           End If
       Catch ex As Exception
           MessageBox.Show(ex.Message, "Error: Retrieving SubKeys", MessageBoxButtons.OK, MessageBoxIcon.Error)
       End Try
       'return the subkeys arraylist
       Return arySubKeys
   End Function

Thank you in advance!!