Virus problem

I have gotten behind because of a computer problem. Somewhere I picked up a virus that did a great deal of damage. I suspect it was from an email. They can approach 500 a day in my writer account. My antivirus software scans all of the incoming email, but the virus was a new one that had been recorded yet. I have no idea what people hope to gain by creating virus programs. I suspect a lot of you had your problems too. I am back on track but it is going to take me a while to catch up.