VBA Program Settings

It is important to remember that these functions only work with the following key name:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\

Registry Functions

DELETESETTINGS	Removes (or deletes) a key or section from the registry.
GETALLSETTINGS	Returns the list of key settings and their values from the registry (Variant).
GETSETTING	Reads from the registry and returns the value or key from the registry (String).
SAVESETTING	Writes to the registry and saves a section or key in the registry.

Rather than using the Windows API functions you can use the GetSetting and SetSetting functions.

Call SaveSetting("Userform Positioning", ThisWorkbook.FullName & "-" & Me.Name, "Left", Me.Left") 
Call SaveSetting("Userform Positioning", ThisWorkbook.FullName & "-" & Me.Name, "Top", Me.Top")

VB and VBA Program Settings

This folder does not exist by default
You need to check that it exists before using it

Office 2013