As I indicated above, at the moment I have both Norton and McAfee on my machine. I have now installed Microsoft Security Essentials and Ad-Aware. I did try to install Avast but at 2 hours it was still not finished installing and I gave it up.

Question: Most of them caution against having an active antivirus on board when one is trying to install a second one. JohninKansas hinted at it above- but how does one make certain they are not both active at the same time?