The program I'm creating will be given install in other computers. It's easier to install a program if it's less control and it's size is lesser compare to an application with so many controls. Thanks for your answers, I found a code which solve my problem. Here it is:
Option Explicit
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Declare Function SystemParametersInfo Lib "user32" Alias _
"SystemParametersInfoA" (ByVal uAction As Long, _
ByVal uParam As Long, ByRef lpvParam As RECT, _
ByVal fuWinIni As Long) As Long
Private Const SPI_GETWORKAREA = 48
Private Sub Form_Load()
Dim r As RECT
SystemParametersInfo SPI_GETWORKAREA, 0, r, 0
With Me
.Move r.Right * Screen.TwipsPerPixelX - .Width, _
r.Bottom * Screen.TwipsPerPixelY - .Height
End With
End Sub