I used it for Dead Space 1 and 2 but now it do not open!

[DosGames]

I used it to play all Dead Space 1 and started use for Dead Space 2 but now when I open it! it stay open on Task Manager but it doesn't show on the windows is running like in background! Something stuck it! When I press the shotcut to change the FOV it works on DeadSpace 2 (because I had setup it before) but the program doesn't show on the screen to select another game