Final answer:
Regularly update antivirus software and use strong and unique passwords.
Step-by-step explanation:
Two actions that can help solve the problem of computers being susceptible to malware infection are:
- Regularly update antivirus software: By keeping the antivirus software up to date, it can detect and remove the latest malware threats.
- Use strong and unique passwords: Weak and easily guessable passwords can make it easier for hackers to gain unauthorized access to computers. Using strong and unique passwords can help prevent malware infections.
On the other hand, disabling firewall protection and downloading files from untrusted sources can actually increase the risk of malware infection.