Antivirus are small software programs that are designed to spread from one computer even to another and to interfere by means of computer operation.
A strain might.. corrupt or delete data on your desktop, use your e-mail routine to spread itself to other computers, or even erase everything on your hard disk.
Antivirus are often spread just by attachments in e-mail messages or instant messaging emails. That is why it is crucial that you never open e-mail attachments if you know who it’s from and you just are expecting it.