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Private Declare Function ChangeDisplaySettings Lib "user32" Alias "ChangeDisplaySettingsA" (lpDevMode As Any, ByVal dwFlags As Long) As Long
Private Declare Function EnumDisplaySettings Lib "user32" Alias "EnumDisplaySettingsA" (ByVal lpszDeviceName As Long, ByVal iModeNum As Long, lpDevMode As Any) As Boolean

Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000
Const CCFORMNAME = 32
Const CCDEVICENAME = 32

Private Type DEVMODE
dmDeviceName As String * CCDEVICENAME
dmSpecVersion As Integer
dmDriverVersion As Integer
dmSize As Integer
dmDriverExtra As Integer
dmFields As Long
dmOrientation As Integer
dmPaperSize As Integer
dmPaperLength As Integer
dmPaperWidth As Integer
dmScale As Integer
dmCopies As Integer
dmDefaultSource As Integer
dmPrintQuality As Integer
dmColor As Integer
dmDuplex As Integer
dmYResolution As Integer
dmTTOption As Integer
dmCollate As Integer
dmFormName As String * CCFORMNAME
dmUnusedPadding As Integer
dmBitsPerPel As Integer
dmPelsWidth As Long
dmPelsHeight As Long
dmDisplayFlags As Long
dmDisplayFrequency As Long
End Type

Public Sub ChangeResolution(iWidth As Single, iHeight As Single)
On Error Resume Next
Dim DevM As DEVMODE
Dim a As Boolean
Dim i As Long
Dim b As Long
i = 0
Do
a = EnumDisplaySettings(0&, i&, DevM)
i = i + 1
Loop Until (a = False)
DevM.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT
DevM.dmPelsWidth = iWidth
DevM.dmPelsHeight = iHeight
b = ChangeDisplaySettings(DevM, 0)
End Sub

В  форму  при  загрузке :

scrW = Screen.Width \ Screen.TwipsPerPixelX
scrH = Screen.Height \ Screen.TwipsPerPixelY


If scrW = 640 And scrH = 480 Then MsgBox "ВНИМАНИЕ!" & vbCrLf & "У Вас установлено разрешение экрана 640х480. Программа оптимизирована для разрешения экрана 800х600 и больше!": End

'Если разрешение не равно 800х600 то меняем на 800х600
If scrW <> 800 And scrH <> 600 Then ChangeResolution 800, 600