Reclaimed Fortnite Startup Error?

I wanted to start the game Fortnite today. But this does not work anymore. There's always something like the game could not be started. And then something with AntiCheat. It always worked without problems. Since this Anti CHeat is Lets not start it anymore. I have already updated Windows, restarted the game / launcher and even completely reinstalled. I also tried to open Fortnite as an administrator. Nothing works.

You should echo what exactly is there, maybe even send a screenshot here otherwise it will be hard to impossible to help you.