Filtering on protected operating folders?

Code:

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Dim MyRoot As New System.IO.DirectoryInfo("C:\")
        For Each MyDirInfo As System.IO.DirectoryInfo In _
        MyRoot.GetDirectories("*", IO.SearchOption.TopDirectoryOnly)
       
            MessageBox.Show(MyDirInfo.FullName)
         
         
        Next

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I have a simple procedure looping thru files on a specific root/drive. I want to filter on system folders that are not accessable. i cant seem to find an attribute that relates to that?

Just handle the exception that gets thrown and move on.