Norton security installed perfectly but now its missing in mini toolbar

i installed the antivirus  without problem  it worked fine and scanning updating etc but now its odd the antivirus  icon which is always near my wifi icon is missing i cant seem to even turn on my antivirus security program either   i click on the app nothing  it happen 2 two of my laptop now plz help 

 

gave me error  8504, 101 can you help me