Sometimes, when you install some applications in your system (Laptop/Desktop) virus also installed and infects your Windows. Don’t install unauthentic Antivirus because hackers always target in a way that Microsoft Windows always need some Antivirus Software.
What is the Best Protection for Windows?

AVG Antivirus 2019 provides world-class protection with a bunch of features useful to tackle problems like virus attack, cyber attack, database fluctuation or data loss.