Auto Hide Columns If Data Sheet Is Empty?

I've created an excel workbook to automatically create a report for my work. All you have to do is enter the data into the "DATA" worksheet. Easy. Only problem is that someone can easily ruin it if they try to run it when the "DATA" sheet is empty. I figure that if I can get two columns hide when it's empty and that would solve my problem. I've tried several VBA codes, but they don't work. Also, everything except the "DATA" sheet is protected to prevent accidently changes. This is the latest code I've tried:

VB:
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Address = "DATA!$P$5" And Target.Value = 0 Then
ActiveSheet.Unprotect ("password")

[Code].....