I've got a 2014 XP system that is shuting down by itself and restarting

Hi Art, I sincerely apologize for the difficulties you are currently experiencing. I have sent an e-mail to you, please use the e-mail and get connected with Remote Team. Our Remote Technicians will look into your computer and will resolve it for sure. Thank you.

Started doing it after I I ran  the computer for a short while. I got a message that my Firewall was turned off and to restart it with AVG…

Hi Art, I sincerely apologize for the difficulties you are currently experiencing. I have sent an e-mail to you, please use the e-mail and get connected with Remote Team. Our Remote Technicians will look into your computer and will resolve it for sure. Thank you.