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The BEST way to secure the workstation quickly when walking away is to use a key combination to lock the computer when leaving1

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 error message indicates that the security certificate presented by the website has either expired or is not yet valid. This can happen if the computer's clock has the wrong date or time, as SSL/TLS certificates have a specific validity period. If the clock is off by too much, it may cause the certificate to fail to validate. Therefore, the technician should check the computer's date and time and ensure that they are correct.

Rebooting the system in safe mode will limit the number of programs and processes running, allowing the antivirus system to more effectively identify and remove the malware. Rescanning the system will allow the antivirus system to identify and remove the malware while preserving the user's files.