This will ensure that the user is the only one who knows their password, and that the new password is secure.
The CompTIA A+ Core 2 220-1002 exam covers this topic in the domain 1.4 Given a scenario, use appropriate data destruction and disposal methods.

https://partners.comptia.org/docs/default-source/resources/comptia-a-220-1102-exam-objectives-(3-0) When a user reports that their workstation is behaving strangely after opening a suspicious email, the first step a technician should take is to run a virus scan on the computer. This is because opening a suspicious email is a common way for viruses and malware to infect a computer. Running a virus scan can help identify and remove any infections that may be causing the computer to behave strangely.

The installation of home edition software on computers at a local office most likely violates the EULA. EULA stands for End User License Agreement and is a legal contract that specifies the terms and conditions for using a software product or service. EULA typically covers topics such as license scope, duration and limitations, rights and obligations of the parties, warranties and disclaimers, liability and indemnity clauses, and termination procedures. EULA may also restrict the use of home edition software to personal or non-commercial purposes only, and prohibit the use of home edition software in business or professional settings. Violating EULA may result in legal actions or penalties from the software vendor or developer. PII stands for Personally Identifiable Information and is any information that can be used to identify or locate an individual, such as name, address, phone number, email address, social security number or credit card number. PII is not related to software installation or licensing but to data protection and privacy. DRM stands for Digital Rights Management and is a technology that controls or restricts the access and use of digital content, such as music, movies, books or games. DRM is not related to software installation or licensing but to content distribution and piracy prevention. Open-source agreement is a type of license that allows users to access, modify and distribute the source code of a software product or service freely and openly. Open-source agreement does not restrict the use of software to home edition only but encourages collaboration and innovation among developers and users. Reference: CompTIA A+ Core 2 (220-1002) Certification Exam Objectives Version 4.0, Domain 5.1

The technician should disable the user's access to the device's command shell. This will prevent the user from accessing sensitive data and will help to prevent further data leaks. The technician should then investigate the unapproved application to determine if it is the cause of the data leak. If the application is found to be the cause of the leak, the technician should uninstall the application and restore the device to factory settings. If the application is not the cause of the leak, the technician should investigate further to determine the cause of the leak. Disabling the ability to install applications from unknown sources can help to prevent future data leaks, but it is not the next step the technician should take in this scenario. Ensuring the device is connected to the corporate WiFi network is not relevant to this scenario1

If a rootkit has caused a deep infection, then the only way to remove the rootkit is to reinstall the operating system. This is because rootkits are designed to be difficult to detect and remove, and they can hide in the operating system's kernel, making it difficult to remove them without reinstalling the operating system
https://www.minitool.com/backup-tips/how-to-get-rid-of-rootkit-windows-10.html