Maybe you don't know, when replying to a post, just input the following characters, and you can immediately tell if your computer is infected with a virus. If it works, there's no problem. If it doesn't work, you need to enhance the control of your computer.
Characters:
&； # 9 8 2 5 (remove the spaces), and it should display ♡. If not, your computer may have Trojan horse programs (used to steal QQ, email, online banking passwords, etc.).
&； # 9 8 2 4 (remove the spaces), and it should display ♠. If not, your computer may have screen monitoring software (which monitors your screen and can view your current operations, thus *your privacy).