hello. Install something like AVG or Malwarebytes, but treat this as you would a lock on your front door and augment the system with safe computing and browsing practices. Patch your OS and desktop applications regularly. Learn to recognize malicious emails and attachments. Use ad blockers and script blockers to augment a security-conscious browser like Goolge Chrome. Use a password manager like Lastpass or similar tools to promote use of strong passwords. I bought my internet security software on one local store in canada btw.