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Although User Account Control (UAC) is an important part of Vista's security infrastructure as it blocks software from silently gaining administrator privileges without the user's knowledge, it has been widely criticized for generating too many prompts. This has led many Vista UAC users to consider it troublesome, with some consequently either turning the feature off or (for Windows Vista Enterprise or Windows Vista Ultimate users) putting it in auto-approval mode. Responding to this criticism, Microsoft altered the implementation to reduce the number of prompts with SP1. Though the changes resulted in some improvement, it did not alleviate the concerns completely.