The history displays the actions you applied to viruses, spyware, and other potentially unwanted software that Microsoft Security Essentials has detected on your computer.
To view or clear the history
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Click the History tab.
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In Windows Vista or Windows 7, click View details to see all of the items. If you are prompted for an administrator password or confirmation, type the password or confirm the action.
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In Windows XP, you need to log on as an administrator on the computer to see all of the items.
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To delete all of the items in the list, click Delete history. If you are prompted for an administrator password or confirmation, type the password or confirm the action.