A couple of hours ago I discovered I have been running for the last 3 months without a virus checker. I was using Zonealarm suite but they brought out a new version that conflicted seriously with one of my applications so I deinstalled it and reinstalled just the free firewall version. Later on that evening I had intended to buy a new AV program but plainly I never did. I just bought BitDefender and installed it. It seems to get good reviews. Amazingly after 3 months unprotected my machine is still clean. Lucky or what? Downside is the machine is a tad slower but only just.