If LiteStep is frozen you can't do anything, you can't even get to the "Oh Shit!" menu. The only thing you can do is kill it with the task manager and restart. I have had problems with certain modules though and that is why I have the "Hard Recycle" option. If the LS core isn't frozen though, you can do the !Quit followed by the start as stated above. It will spawn both commands one after the other but it will try and start LS before the !Quit gets processed.