The Epic Games official forums have been attacked recently with disturbing, sad, and true news that the game cannot run, with a message prompting the player to reinstall the game.

As of January 28th, the game's digital certificate has expired, so anyone playing close to the midnight of the 27th then your computer's internal clock clicking over to the 28th immediately exited out. Epic has "been notified of the issue and are working with Microsoft to work it out."

A quick fix before a permanent fix ever comes out is very simple. Just change your computer's internal clock to an earlier date. Do you see the clock on the corner of your computer? Yeah, that's the internal clock. If you don't know how to fix it...umm...google it.