I ran into this issue today with windows defender, before I say this no I do not have another ant-virus program of that sort. Basically in Windows Defender I have Turn-On Real Time Protection checked in the settings tab.. but under the home tab it shows its off. When I check it to turn on it takes a long time to load and I get an error saying it cant be turned on, I have 2 Pictures please look at them. I also tried messing with the services and it doesent let me restart or discable etc. Also my windows is up to date and no virus is on my computer.