Don't mean to be a sourpuss, but...
A friend of mine bought a high-end HP laptop @ Best Buys, a few years ago -- fanciest laptop I've ever seen -- glowed like a pinball machine, when it was running -- backlit keyboard, and all that sort of stuff. Most have cost a fortune...
When the Norton trial version expired, she started getting pop-ups about having to pay, by such n' such date, if she wanted to keep her data secure, blah, blah, blah. I told her to remove Norton, in the software manager (whatever MS calls it), and install the free version of Avast!
A few months later, she couldn't open emails, log into her bank accounts, and so forth and so on. Best Buys couldn't figure it out, nor the IT department at the place she works. She was heart-broken, and asked me if she should buy a new laptop.
I told her, I'd take a look at it, if she didn't mind me keeping her laptop for a week or so...
After 2 days of fishing around, I traced it down to remnants of the Norton Security Trial Suite.
Long story short: That #$@! thing is like a virus! It injects itself into the core system DLL files. Uninstalling Norton doesn't return these files to their original state.
I'm afraid, you'll need to go to their website and download a very obscure, well hidden, utility to fully remove Norton from your mom's new laptop, and patch the system.
EDIT
Found it! Do search for "SymNRT".
There are 17 versions running around. Choose wisely...