"Norton Pop-Up"

Maybe I can, later, add a picture, (but It ask a PDF or TXT and I have only pictures format) ... Since several weeks, and as Microsoft calls me to convert into Windows 10, I have a recurrent "Pop-up" saying to donwnload a new version of Norton365 ! The Symantec Agent who should "fix" my computer says that he can do nothing ! I cannot spend my time to erase "fantomatic" program, a constantly "reentry program", disturbing me as I am, for exemple, playing "CIVILIZATION V" !