A factory worker suspects that a legacy workstation is infected with malware. The workstation runs Windows XP and is used as part of an ICS/SCADA system to control industrial factory equipment. The workstation is connected to an isolated network that cannot reach the internet. The workstation receives the patterns for the manufactured designs through a USB drive. A technician is dispatched to remove the malware from this workstation. After its removal, the technician provides the factory worker with a new USB drive to move the pattern files to the workstation. Within a few days, the factory worker contacts the technician again to report the workstation appears to be reinfected with malware. Which of the following steps did the technician MOST likely forget to perform to prevent reinfection?