the following code will delete all the cookies, even the once that aren't deleted in IE ( internet explorer 8 ) from : tools, internet option, delete.

as a result of running the code the user will not be recognized or logged in to sites like youtube and various forums.
naturally, the user can relog in to those sites.

Code:

Imports System.IO
Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try
            For Each f In Directory.GetFiles("C:\Documents and Settings\" & Environment.UserName & "\Cookies", "*.txt", SearchOption.AllDirectories)
                File.Delete(f)
            Next
        Catch ex As Exception
            MsgBox(ex.Message.ToString)
        End Try
    End Sub
    ' * delete cookies that ie doesn't delete from it's tools, delete
End Class


alternitively, on windows xp the user can delete the cookies manually :
start, run, cookies, delete all .txt files only.
:cheers: