To get rid of that dll, involves re-installing your Norton application, starting it up, then disabling all of the app features like real time/system protections, run at startup, automatically check for updates, scan on drive insertion etc.. via the applications "options" or "configuration" for each of it's little feature sets... once you get the application so that it's just "installed on the drive" and not running, at startup, or any time, unless you run the .exe
Then you have to reboot the computer, open up the startmenu, control panel, or settings/control panel? then administrator tools, then "services" find any DLL or "service" related to your antivirus/antimalware application, then set the service to "disabled" then click stop... You may have to restart windows and go into safemode for the service to actually stop. Then you have to open task manager and ensure that there are no instances of that file, or any other of your antivirus's file's runing in processes or applications... Once you have verified that, then you run the removal tool..... It's a real pain..