did you ask for it?
do you need it
if not then leave it off as most toolbars are trackers as such.
Norton is a reasonable security suite but you still need to use common sense when browsing the web, stay away from dodgy sites.
Be careful when downloading and installing programs - always use the custom install and untick / refuse all the extra "crap" that comes packaged with the installer.
ADWcleaner is free and will rid your computer of PUPs (Potentially Unwanted Programs) and "addon ons" / tool bars
CCleaner is another free program that will clear temporary files and tracking cookies from browsing (use on a regular basis)
There are many silver surfers on this forum with plenty of experience willing to help - just ask.
Enjoy your first computer.