I had a similar experience.
Once been fixing my halfsister's computer from viruses. It was in 2005
and she had the Norton AV/firewall 2005 suite thingy. Regularly updated
(some of the updates I monitored myself to ensure they progress without
a problem).
She only invited me to fix the computer once it was crawling with
trojans so hard it was impossible to use. Norton was in it's standard
configuration, with daily scanning and all, so no excuses on that part.
I have been going trough my usual procedure of removing the infestation
manually, which I do always when an antivirus that a client has
installed is not removing the problematic viruses (we have Sophos AV at
work, so I'm pretty much used to AVs that might as well not be installed
at all). At that point, the Norton Firewall thingy was blocking valid
programs like hell, the programs had to be added and re-added over and
over again. And I have used every technique I know of to block the
websites that trojans downloaded themselves from, including using
Norton's own features, but Norton just kept on removing whatever it was
I did and reinstating the settings provided by the trojans.
I figured I was fighting a loosing battle, so I tried removing Norton.
The Norton programs, atho from a single software package were all over
the Add/Remove Programs menus and kept complaining about which program
to uninstall first. Finnaly I figured out that the program I was
supposed to uninstall could not be removed because of some kind of error.
I FireFoxed a little bit around the web and downloaded the Norton
removal utility. It worked, I was only a reboot away from removing this
really helpful AV program. Upon reboot there was a substantial increase
in the computer's speed. Note that at this point I had not removed the
trojans yet, but the system was still much faster than with Norton. (In
other words, Norton uses up more resources than a swarm of tojans.)
I installed AntiVir, from that German red-umbrella company (a free
antivirus program) and Lavasoft's Ad-Aware and within a few scans and
reboots, the system was as clean as new, not to mention much faster than
with Norton. Kept on going without a firewall for the few months until
my sister brought a hardware firewall / router and never had any
problems since.
Call this anecdotal evidence or not, I very much know that if a suite
that was supposed to provide all-round protection gets compromised like
this so easily, it isn't worth shit. I have never ever seen an
anti-virus / firewall package help viruses propagate and prevent the
user from installing fixes like Norton does.
Saying the government uses it doesn't help the cause. I believe the
entire Italian government got porn-infested one pretty day when a
certain scriptkiddie decided to try out his latest kit. And the
government here all uses Sophos, which isn't worth much either as far as
I've seen (get about 5 computers to clean up per 1 alert of virus
detected in the network).
Saying Norton is at all a useful piece of software is a bit like saying
"Format C:" is a good remedy for hardware problems. It takes a fair
amount of ignorance to see that as a truth.
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