Assigning button to read registry value?

Hello! I need a little help
I managed to get the GUI, i wanted for my software. Here is the code:

#include <ButtonConstants.au3>
#include <GUIConstantsEx.au3>
#include <ProgressConstants.au3>
#include <WindowsConstants.au3>

$SCO = GUICreate("blahblah..", 394, 194, 192, 124)
GUISetIcon("blahblah..", -1)
$Progress1 = GUICtrlCreateProgress(8, 168, 374, 17)

$Button1 = GUICtrlCreateButton("Analyze", 8, 136, 123, 25)
I want it to read multiple registry keys? When you press the analyze button and display the registry keys value with progress bar as it reading through it, In the GUI?
I tried multiple codes but its not working out. A little help to work it out? Thanks in advance.

GUISetState(@SW_SHOW)

While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit

EndSwitch
WEnd