Norton protection on Apple Safari

Greetings from Mugwump     I cannot fully implement protection for Safari on Apple iMac became I am repeatedly told  I must first uninstall Norton security 6.  I can see numbers one to five but no six.     When opening Safari I often get  a popup page stating that there is inability  for Norton Security to connect with Safari.      It sometimes feels as though Apple are blockng the process

I have tried Norton Support as that page suggests  and they  come on line readily and friendly, but the moment I try to go over to Norton on screen control of the Mac, Safari crashes and the link is lost   I am considering uninstalling Norton  and immediately  re-installing but do not like doing things I do not fully gasp