I've been building PC systems for years and have fixed who knows how many virus laden machines over the years. I have used almost every virus system that is out there and recommend hands down Kaspersky Internet Security!
Norton is such a memory hog and does not catch everything. Its so popular because of the contracts they have to be installed on new machines. Its one of the worst ones out there in my opinion!
I've installed Kaspersky on well over 100 machines and most of them for people that also had problems with clicking on the wrong stuff and filling their machines with ad ware!
4 programs I recommend to be loaded on all machines.
Internet Security Software 2010 for Home Computer Security - Kaspersky Lab
Glary Utilities - Reviews and free Glary Utilities downloads at Download.com
Glary Utilities... its free and keeps your system nice and tidy!
Revo Uninstaller - Free software downloads and software reviews - CNET Download.com
revo uninstaller its free, use it to uninstall any programs you don't want on your system. It gets all the files left behind.
CCleaner - Free software downloads and software reviews - CNET Download.com
ccleaner free as well... great little program that cleans up your pc as well!
No need for any ad ware removal programs as Kaspersky catches all ad ware!
I have 6 kids that and 5 computer systems at the house and many years ago when I wasn't using Kaspersky I would have all kinds of computer issues. Since I started using Kaspersky I have not had a single ad ware or virus and believe me when I tell you a few of my computers are really put to the test!