Norton Interner security toolbar problem

Respectfully, I have Norton Internet Security(last English version), a few days ago I downloaded the last version of the Google Chrome and then I noted that my NIS security toolbar had created prolem only for my Google chrome browser (and not other browsers) in this sense that the scroll down bar of the right scroll bar of the google chrome disappeared along  with that the page was blocked or functioed so slowly; in particulare when I open new tab; I noted the problem originated from the NIS security toobar extention in Google Chrome after I had carried out all the instructions, after I had disabled the NIS security tool bar extention, the problem was solved, this is my question and concern if I  disable  my NIS security tool bar extention , my computer will not be at risk?

I would like to thank you for the attention.

shahram