Etrust is made by Computer Associates. Everything they do is junk. Support is non-existent.
I don't like Norton because I have had a Norton virus scanner that would not let me send e-mail to my Toastmasters club because it was "too many recipients." I have also had bad rescue disks. Norton also auto-responds to viruses, which is generally a useless and wasteful process.
I haven't used McAfee since 1998. I remember it took ten months to get a rebate from them, and then the rescue disk didn't work.
I have recently tried PC-cillin from Trend Micro. It seemed like a good product. Unfortunately, the virus scanner came bundled with a firewall that crashed my PC every time I tried to print a web page. I removed the virus scanner, and the problem went away.
AVG is a very slow scanner. It also just told me that I had Nimda, but didn't remove it.
The least troublesome virus scanner I have seen over the years is F-Prot. I remember it missed a virus once. But it did fix Nimda twice. You can get a DOS-based version for free, which should scan most Windows machines. This version still only takes up three floppy disks.
I'm not sure if there are any good virus scanners out there. We use Norton at our office, and it has kept us pretty safe. Updating is working pretty well. Maybe it works well because it is running on Novell.
My eyes have been my most reliable virus scanner. It is easy to tell if an e-mail has a virus. I just look at the header information so I can notify the sender, and then I delete it.