Your PC will always be at risk of falling victim to malware or hacking, to some extent. You can encrypt your files and folders by right-clicking them and selecting “Properties.” Choose the “Security” tab, and hit “Advanced.”
Then, check the box next to “Encrypt contents to secure data.” Click “OK” to close the window, and then hit “Apply” and, lastly, “OK” again. This process will mean only a user with the correct key can access the file or folder.