I have installed the free Anti-virus program (more than once). But it does not stay on. It said it was installed and the computer was re-started. But a few minutes later, a red flag appears at the bottom of the desktop, saying I should turn on and update Avast Antivirus. I click on it, and nothing happens. I click on the box that says I trust this program's publisher, and still nothing happens. This is extremely frustrating and I don't know what is wrong. If anyone has simple, easy-to-understand advice, please reply. Thanks.
