Explanation
The first step in removing a virus from a computer is to update the antivirus software with the latest virus definitions. Virus definitions are files that contain information about the characteristics and behavior of known viruses and malware. They help the antivirus software to identify and remove the malicious threats from the computer. Without the latest virus definitions, the antivirus software may not be able to detect or remove the virus that infected the user's computer. Therefore, the technician should download the latest virus definitions from the antivirus vendor's website or use the update feature in the antivirus program before scanning the computer for viruses.
References:
How to remove malware or viruses from my Windows 10 PC, section 21
How to Remove a Virus From a Computer in 2023, section 32
The Official CompTIA A+ Core 2 Study Guide (220-1102), page 2193