Final answer:
User Account Control (UAC) is the Windows feature that notifies users of attempts to make changes to a computer without their consent.
Step-by-step explanation:
The Windows feature that notifies you when something tries to make changes to your computer without your knowledge is User Account Control (UAC). When a program tries to make a significant change to your system, UAC sends an alert asking for administrative permission to proceed. This feature helps prevent potentially harmful programs from making unauthorized changes, thereby protecting your computer's security and integrity.