You also have to go turn on the built-in ones yourself initially, then you can leave them on. The not-built-in PC ones have a setup wizard. What AnpuRa describes is closest to a phone screen reader, as PC users would be taught to navigate mouseless - again, Android's has to be deliberately downloaded and iOS's announces its name at screen reader start up, and anyone who's been trained on it will have the name of the program repeatedly mentioned by their instructor in my experience with the DVR / blind training.
Re: AnpuRa
You also have to go turn on the built-in ones yourself initially, then you can leave them on. The not-built-in PC ones have a setup wizard. What AnpuRa describes is closest to a phone screen reader, as PC users would be taught to navigate mouseless - again, Android's has to be deliberately downloaded and iOS's announces its name at screen reader start up, and anyone who's been trained on it will have the name of the program repeatedly mentioned by their instructor in my experience with the DVR / blind training.