Thanks for that explanation - that would make sense. I don't have Norton or McAfee, I have Avast. I had Avast on my old hard drive and was very happy with it, so asked the computer shop to instal it for me on the new hard drive before I brought it home. Btw, I also ran Spybot, and though it didn't throw up the Disabled.Security items, it did throw up "Microsoft.Windows.ApptFirewallBypass", whatever that is. I didn't know whether it was ok to ask about that here or whether I needed to find a Spybot forum. I checked, and my Windows Firewall is definitely switched on. Talk about "the more I find out, the less I know"