As I said, this computer was like "new" on Monday. It has nothing on it. I downloaded the Avast and some other software programs i.e. Microsoft products, Earthlink toolbar and maybe one other. This doesn't occur off line, but online it will just freeze up, alarm goes off and the screen blinks. One time the alarm went off, screen was ok and you could continue to surf but the sound did get annoying. The operating system is Windows 2000 and there was absolutely nothing done prior to these events (like patches). I haven't gone to Microsoft for any updates on Windows 2000 yet. Could that possibly be the problem or nothing to do with Avast? I was thinking it had a firewall problem, but I see Avast doesn't have a firewall. Again, no other virus program to conflict with.