How to disable UAC in Windwos Vista and win 7

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VB

Hi,

I am writing program installer using VB.Net and I am facing difficulty in disabling UAC to complete the installaion.
Here is the code that I am using it to disable the UAC:

Dim regKey As RegistryKey
        Dim ver As Decimal
        Dim keyst As String = "Software\Microsoft\Windows\CurrentVersion\Policies\System"
        regKey = Registry.LocalMachine.OpenSubKey(keyst, True)
        ver = regKey.GetValue("EnableLUA", 0.0)
        If ver = 1.0 Then
            regKey.SetValue("EnableLUA", 0)
            'My.Computer.Registry.SetValue("HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System", "EnableLUA", 0)
        End If
        MsgBox(regKey.GetValue("EnableLUA"))
        regKey.Close()

I am attempting to write values to the registry, but get an
UnauthorizedAccessException when I try to do a SetValue on an existing key.

Any help please :)