### Comment:
What are some signs that indicate a computer may be infected with malware?

### REPLY:
One sign that indicates a computer may be infected with malware is the presence of a keylogger, which records all keystrokes made by the user. This can be used to steal sensitive information such as passwords and credit card details. Another sign is the appearance of ransomware messages, where the attacker demands a ransom in exchange for unlocking encrypted files on the computer.