There are lot of antivirus software comoany in while world. Some them is useful but some of them is harm the pc. Beware of lot of trojanhorse, worms etc. viruses. Use active antiviruses for pc to secure pc from viruses. It alsi safe your data in the pc. It also stop hackers to stop hacking files. When you use antivirus take product key of antivirus. When you install antivirus firstly scan all the computer. If there is any virus than dont igone delete it. If you ignore it it harm your oc it delete your documents or copy various files. Use always certified antiviruses software. It is very important for our pc