A computer is slow, unknown messages appear, and unknown applications open. What is the most responsible step?

Correct answer: Run a security scan and avoid suspicious applications

Unexpected slowness, unknown messages, and applications opening by themselves can indicate malware or another security problem, although they are not absolute proof. A security scan is a responsible first step, and suspicious links or programs should not be opened. Sharing passwords or deleting every file can worsen the situation and may destroy useful evidence or work.