How to allow application to write to registry in Win7

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Visual-Studio

I desperately need help with this problem: I have the follwing code that works perfectly on Windows XP, but the same code throws up an error about access to registry key being denied.
Here is the code:

Private Sub KillTaskManager()
        Dim regkey As RegistryKey
        Dim keyValueInt As String = "1"
        Dim subKey As String = "Software\Microsoft\Windows\CurrentVersion\Policies\System"
        Try
            regkey = Registry.CurrentUser.CreateSubKey(subKey)
            regkey.SetValue("DisableTaskMgr", keyValueInt)
            regkey.Close()
        Catch ex As Exception
            MsgBox(ex.Message, MsgBoxStyle.Critical, "Registry Error!")
        End Try
    End Sub

Can anyone suggest solution