To help protect user privacy, Microsoft Security Essentials enables the local computer administrator to limit viewing the detected items for all of the users on the computer in the History tab.
To allow only the local computer administrator to view all detected items
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Click Settings, and then click Advanced.
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Clear the Allow all users to view the full History results check box, and then click Save changes. If you're prompted for an administrator password or confirmation, type the password or confirm the action.