Win32::Registry - delete_value - system cannot find file specified

Using: Windows 7 Pro SP1 x64

I'm trying to delete an existing value in my registry (verified
existence using regedit) with the following code:

···

####
require 'win32/registry'

keyname = 'SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate'
access = Win32::Registry::KEY_ALL_ACCESS

Win32::Registry::HKEY_LOCAL_MACHINE.open(keyname, access) do |reg|
  reg.delete_value('SusClientId')
end
####

the output of which yields the following exception:

C:/Ruby200/lib/ruby/2.0.0/win32/registry.rb:768:in `delete_value': The
system cannot find the file specified. (Win32::Registry::Error)
        from C:/main_script.rb:7:in `block in <main>'
        from C:/Ruby200/lib/ruby/2.0.0/win32/registry.rb:389:in `open'
        from C:/Ruby200/lib/ruby/2.0.0/win32/registry.rb:496:in `open'
        from C:/main_script.rb:6:in `<main>'

Could anyone help me with some insight? Thanks in advance

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