In order to play Elsword on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Windows 10 64-bit or better
Processor (CPU):
Intel Core i5 or higher
Memory (RAM):
4GB or higher
Graphics Card:
NVIDIA GEFORCE GTX 1050 or better
DirectX®:
9.0C or better
Hard Drive:
20GB or more free space