Make sure your PC meets the minimum system requirements of your game, please.
Some types of software and processes on computers are also known to be conflicting with games.
If you cannot find any specific type of software that might be causing an issue, e.g. an anti-virus or firewall, verify your game files and try running the game again, please.
Go to your game in the Epic Games Launcher, click the options icon on the right side of the screen and select VERIFY: