An antivirus is a software used to delete viruses on your VPC or any other computer, even NPCs. To be able to delete a virus, you must make sure it is installed, which shows a red bug icon next to it. If it's a cog icon, it's only the setup, which is ready to be installed. It is strongly recommended to get a hider to hide your antivirus as many people delete them when they hack your VPC.