When I add a CPU miner windows defender tells me its a bad Trojan? so it wont work.

Also when I am running the miner which is set to auto exchange, when its mining then it switches to another coin mine, my GPU reports that it block this and crahes my machine this happens all the time so its impossible for me to use.

I am newbie noobie so any help would be good so I can get this mining. Thanks