Is it okay to disable Symantec NCO BHO?

I just got a new computer and loaded Norton 360 on it.  Doing this has added a Norton toolbar in IE8 and I think I want to get rid of it.  So when I click the X to remove the toolbar, or uncheck the toolbar in the Tools menu, I get a warning telling me that it is also going to disable the Symantec NCO BHO add-on.

 

So I'm wondering what that is, and do I care if it is disabled or not?

 

Thanks!

DC2