A user brings in a home desktop computer for cleaning.
Upon opening the computer, a technician finds large amounts of dust and dirt inside.
Which of the following should the technician use to remove the excess dust and dirt?

A user believes there is a virus on a laptop. The user installs additional real-time protection antivirus software but is now experiencing extremely slow performance on the laptop. Which of the following should a technician do to resolve the issue and avoid recurrence?

While troubleshooting a software error on a user's computer, a technician finds inappropriate content.
Which of the following should the technician perform FIRST?

A Mac user's operating system became corrupted, and files were deleted after malware was downloaded. The user needs to access the data that was previously stored on the MAC.
Which of the following built-in utilities should be used?

Joe, a user, notifies Ann, a technician, of a message that is displaying on his screen. The message has taken over the entire screen, and no icons are displayed. Joe, further explains that the message still appears after several reboot attempts. Upon further inspection of the affected PC, Ann notices a request for cryptocurrency payment to obtain the unlock key.
Which of the following is MOST likely the cause?