Sherryh,
By far the top of the line for years has been ESET.
They were eating every other virus detector's lunch and the reviews showed it.
Then Norton and McCaffee changed the test suite to include certain kinds of malware that
they were good at, so it looked like they were the top dogs for awhile, and some of those reviews are still out there, but ESET is the best at protecting against virus' and trojans, and
really good at malware type protection.
A few years ago, one of my computers got a zero-day virus, that is, I caught a virus on the first day it was released--nobody had a fix for it yet, and ESET stopped it, but couldn't repair it, till the next morning they sent me a repair file for it. My boys had already figured out how to remove the virus and which windows files needed to be replaced and which extra files needed deleted by telnetting into the computer by a linux computer which couldn't get the virus.
One of our mothers had 131 infections, because all the grandkids wanted to come over and "help" grandma by installing thing willy-nilly to show her, with predictable results.
We switched her over to using ESET, then after she was comfortable with it, we switched her over to Linux and no virus's or malware for the last 5 years.
You said you have a solution now, that is great, but if you have to buy one in the future, I strongly recommend ESET products. I've always gotten good service from their 24/7 help line.