There is a background Trojan virus on the computer. It will be sent to you automatically when you log on QQ.

3 install antivirus, I personally use Kaspersky, but in this case, I recommend you to use the German antivir free version, just for antivirus. After antivirus is finished, you can switch back to 360 or use AVG.

Or kill someone with a 360 Trojan horse or something.

It is best to kill viruses in safe mode when killing viruses.

If you don't understand, you need to check the information yourself. If you always don't know this, you won't make a mistake next time. People always fall down in one place many times.