Yes they do! Uninstall Norton! No more Popup!! Taa Daa!
They supply a nifty "Norton Removal Tool" to rid yourself of their pesky software too...
Norton Removal Tool - Latest WinXP/Vista/7/8 version
Search Norton's site for "Removal Tool" to find more information.
What do you use instead of norton?
linux.
Oh, sorry.. There's a zillion to choose from, AVG (free) and AVG (pay) are ok, and unfortunately that's the only one that comes to mind, since it's the only one I keep on my "No-I-Won't-Fix-Your-Computer" keychain flash drive. {Sigh}.
Norton & McAfee are huge resource hogs, drive space, cpu cycles and memory.
Try several of the better rated AV's, you'll be surprised how spritely your computer can be.
(I DO recommend MalwareBytes and SpyBotS&D though)
Good luck.
Is it possible to revert to the previous version?
Doubt it.
Even if you COULD find one, it would nag you about upgrading to newest. Gotta make their money!!
Best to just dump it and find a nice, less resource hungry AV. Search around on here, someone's GOT to have asked. It's somewhat subjective though, everyone has their favorite.
I just fix Windows Machines, I don't use one. (or own one!)
ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exe
(WinXP/Vista/7/8 version) Search Norton's site for "Removal Tool" to find more information.