Microsoft Security Essentials support died when XP's did.
https://www.pcmag.com/article2/0,2817,2429423,00.asp
Here http://www.tomsguide.com/answers/id-3506450/lightweight-free-working-antivirus-windows.html some XP user was running this for protection http://www.immunet.com/index#home but it apparently no longer supports XP
http://www.immunet.com/faq
As I would like to get another six months or so of use out of XP, is it too silly to ask if there are any credible security software? Would this be about the safest bet and without being too resource hungry? https://www.avg.com/en-us/windows-xp-antivirus
https://www.pcmag.com/article2/0,2817,2429423,00.asp
Here http://www.tomsguide.com/answers/id-3506450/lightweight-free-working-antivirus-windows.html some XP user was running this for protection http://www.immunet.com/index#home but it apparently no longer supports XP
http://www.immunet.com/faq
As I would like to get another six months or so of use out of XP, is it too silly to ask if there are any credible security software? Would this be about the safest bet and without being too resource hungry? https://www.avg.com/en-us/windows-xp-antivirus