Yeah but even when norton is uninstalled NIS.exe can still hang around and reek havok on your CPU usage. So go to task manager, after you uninstall norton's...if you still see NIS.exe eating up CPU cycles under the details tab, right click it and go to file location. When the window opens up and you can see nis.exe location, end the task on NIS.exe from the same tab under task manager and details. Once it is terminated you should be able to now delete the NIS.exe file from the "go to file location" step. Once this is done verify your CPU usage is good. If so re-install nortons and you should be good.