A customer reports that their workstation has become extremely slow and they suspect it might be infected with malware. You have scheduled a maintenance session and are going to use a set of tools to diagnose and address the issue. Besides running an antivirus scan, which one of the following options is a recommended method in ensuring further protection against malware?
Disable the antivirus software temporarily to eliminate potential conflicts.
Completely reinstall the operating system to guarantee the removal of any infections.
Restore the workstation from a known good backup before performing any scans.
Ensure the antivirus definitions are up to date before proceeding with a full system scan.