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User Account Control (UAC) helps defend your PC against hackers and malicious software. Any time a program wants to make a major change to your computer, UAC lets you know and asks for permission.
In Windows 7, UAC is now less intrusive and more flexible. Fewer Windows 7 programs and tasks require your consent. If you have administrator privileges on your PC, you can also fine-tune UAC's notification settings in Control Panel.
What is User Account Control?
What are User Account Control settings?
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