so sometimes a popup appears, and dark messiah goes down in the taskbar
so i close the popup and open dark messiah and then the screen is all black and i have to close dark messiah via CTRL ALT DEL and reopen it again
can i fix this?

You probably should just ignore the pop up. Or get off the internet so you can't receive pop ups. Inless of course they are related to Dark Messiah like *error* pop ups