A user has reported that their system has been running increasingly slower over the past week and now starting to experience frequent crashes. After your preliminary assessment, you suspect malware might be the cause of the issue. Before proceeding with a full virus scan, which is the FIRST action that should be taken to effectively troubleshoot and address the potential malware infection?
Uninstall and reinstall the anti-malware software to reset its configuration.
Disconnect the system from the network and remove any unnecessary external devices.
Immediately run a full virus scan with the currently installed anti-malware version.
Update the anti-malware software to ensure the latest malware definitions are in place.