I don't think you are able to process that key combination without your own hook under minlogon.
I guess it is a feature of only Winlogon/MSGina.
You can write your own keyboard driver.
Although I think even a user mode agent may catch (VK_LWIN|VK_RWIN)&VK_ALT&VK_DELETE combination.
This article may help you to write the working code quickly: http://msdn.microsoft.com/msdnmag/issues/02/09/CQA/default.aspx
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