#include <ButtonConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>
#include <MsgBoxConstants.au3>

Const $Username = GUICtrlRead ("")
Const $Profile = "C:\users"

#Region ### START Koda GUI section ### Form=
$Form1 = GUICreate("title", 347, 317, 379, 128)
$Label1 = GUICtrlCreateLabel("Please Write your  Username:", 24, 136, 300, 65)
$Input1 = GUICtrlCreateInput("", 32, 216, 297, 21)
$Button1 = GUICtrlCreateButton("OK", 128, 248, 81, 33)
$Pic1 = GUICtrlCreatePic("", 8, 0, 332, 108)
GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###

While 1
$nMsg = GUIGetMsg()
	Switch $nMsg
		Case $GUI_EVENT_CLOSE
		Exit
		Case $Button1
		GUICtrlRead($Input1)
		If FileExists ($Profile & $Input1) Then
			MsgBox (0, "Info", "Username Exists" , 0, "")
		Else
			MsgBox (0, "Info", "Wrong Username", 0, "")
		EndIf
		If FileExists ($Profile & $Input1) Then
			ExitLoop
		EndIf
	EndSwitch
WEnd