Users usually ignore the thing that viruses can enter through the internet, but there are 100% chances of stepping in the viruses to the operating system from the internet itself.Īs every dangerous or destroyable thing has a cause, for that there is a lot of antivirus software launched in the software industry. The virus can be entered from anything, maybe from devices such as CD, pen drive, hard drive, or even internet. As there are several chances to enter the viruses in the operating system. The operating system is nothing if there is no antivirus placed in the system.