Hi, I am a long term user of Norton Internet Security. I use it in my Windows 7 partition under bootcamp. As Windows was not my main OS, I did not care about Norton Internet Security's effect on battery life. Now I need to as I am switching to Windows laptop as my main machine on the go. After switching to Windows laptop, do you just use the built-in Windows defender which came with Windows 10 or use other anti-virus software such as Norton Internet Security/Antivirus?