Once your computer is infected by a virus, the first visible sign is that it will slow sown your computer. Viruses duplicate fast inside your computer memory and eat up useful space. So you need to be sure that your antivirus up-to-date. This will help to defend your computer against viruses.

Sir @focusnow, please permit me to ask, can i also use anti virus on my smart phone? Or, is it limited to computer?