After you have verified that malware is present (Step 1), the very next action (Step 2) is to quarantine the infected system. Disconnecting the PC from all wired, wireless, and removable-media connections prevents the malware from communicating with or infecting other devices. Updating anti-malware software, disabling System Restore, or educating the user are important later in the process (Steps 4, 3, 7 respectively) but do not immediately contain the threat.
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