I have used all the major AV brands at one time or another and...
Panda
Antivirus ActiveScan found every infected file (including those
that were folders
deep in a compressed file) that the other industry leaders didn't even catch the
scent of when they scanned my systems locally with installed software and over the
Internet just before trying Panda Antivirus software for the first time.
Needless to say, I don't go anywhere else now when I even suspect
that one of my systems might have a bug.
If you don't have a recent version of Internet Explorer please
get yours here, because they built this using Microsoft technology,
and the IE web browser is the only one that it works with.
I think it's worth the trouble when they catch all the bugs... that
the others left behind. Don't you??