While playing the Sims 4, my PC will suddenly shut off.

when playing the game my monitor box thingy that i put the dvd in goes loader and loader and then my computer screens go black and it says the monitors going to sleep so when i use my mouse or turn the button on the computer to turn it on it will say no signal so i have to press the monitor button to switch the computer on. Also is it normal while you computer turns on for it to say all the coding on a black screen with white writing. im not sure if that could be why. i have a windows 10 and my dad bought it for almost £40 i dont like it when he waists money on trash. so if there is any way because i have tried them all it will meen a lot to me. Also we have the security thing bitfender and spy bot and a bitefender message would come up saying you can only have 1 security programme other wise your computer will crash but we got ride of spy bot and it still crashes even when i dont play the sims 4.