To repeat what I said in
another thread:
For those that don't know, Computer Associates is a huge, huge company, dwarfing the size of Symantec and the other principals in the antivirus field. This doesn't mean that every one of their products is great, but the support will be there; it's not fly by night.
...
On AVG Antivirus [aka Grisoft], I realize that many people are happy with this, particularly the "everything on the Internet should be free" crowd, but the product does _not_ test out well. Here is the industry standard site for AV testing:
http://www.virusbtn.com/
Drill down to "by vendor," and you see that Grisoft (aka AVG) gets a rather astounding 3 passes/19 fails. In fact, before the last two tests they were batting 1 pass/19 fails!
Norton has passed 16 times in a row at present.
Panda hasn't submitted in a long while, but was 1/3 back in 2000-2002.
Comp.Assoc. has passed the last 7, and 16 of 17.
Every review I've seen has shown Norton using the least system resources, if that is your most important criterion.