How to know that there are virus in computer

If your computer is suddenly doing some unusual motion, then understand that there may be a virus in it, there are some warning sciences about which it is very important for you to know.

If the speed of your computer suddenly decreases, it starts running very slow while its hardware is very good, then understand that there is a virus in the computer.

Suddenly some such files and folders are created inside the computer which you have not created, then understand that there is Virus in your computer.

Along with turning on the computer, if some programs start running automatically and keep running even after you turn it off, then understand that there is a virus in the computer.

If you see popup advertisements repeatedly in the computer, then understand that there is a virus in the computer.