diff --git a/AVISOUPDATER/UPDATERfrm.vb b/AVISOUPDATER/UPDATERfrm.vb
index 8f211c0..e40e05d 100644
--- a/AVISOUPDATER/UPDATERfrm.vb
+++ b/AVISOUPDATER/UPDATERfrm.vb
@@ -13,6 +13,9 @@ Public Class UPDATERfrm
         Dim trd As New Threading.Thread(AddressOf Main)
         trd.IsBackground = True
         trd.Start()
+        'prevent user to close form
+        btnClose.Enabled = False
+
     End Sub