I have Norton SystemWorks and I love it. I'm able to do system maintenance the way I like it, and can find and fix most problems (I'm running Win 98 on my big machine and XP on my laptop).
That said, I purchased the Norton Internet package (I've forgotten the name of it). From the time I downloaded and installed it, that mess acted like a virus or worse. Shutting down some of the more aggressive and intrusive features didn't help. Contacting Norton to get a refund didn't work (no response). No phone number for a help desk, no nothing.
The uninstall was not completely successful - it even reset my system clock to next year, making my subscriptions and definitions and everything out-of-date. All my e-mails were dated incorrectly, etc.
My wife's machine, after I uninstalled the package there, now comes up looking for some of the Norton files every time she boots up. I've done everything I can think of besides wiping out the hard drive and starting over.