Hy,
i've made an excel file with a macro that
execute this operation:
-open a pop-up to put username and password
-check this on-line
-refresh every minute the spreadsheet with some dates from a server

Until now it's all ok,
but on a 2000 professional/Excel 2000 (9.0.2812)
the macro is not execute!
and no error is showed
where's the wrong?

the macro are available!

the firs instruciont of the macro is:

Private Sub Workbook_Open()
10 Worksheets("Dati").Range("A65535").Value = "0"
20 Worksheets("Dati").Range("B65535").Value = "::"
30 UserForm1.Show
End Sub

but the UserForm1 (the pop-up with the form)
doesn't open!

what's the problem/error?

It could be a antivirus?
(this file is on a the pc of my client!)

thank you..
ans sorry for my english!