In order for you to play Castle Crashers on Windows with minimal graphics settings, your computer must meet the following requirements
Operating System:
Microsoft® Windows® 10
Processor (CPU):
Intel Core 2 Duo 2GHz+ or better
Memory (RAM):
8 GB RAM
Graphics Card:
2GB RAM
DirectX®:
9.0c
Hard Drive:
512 MB HD space
Sound:
DirectX compatible
Other Requirements:
Broadband Internet connection
Additional:
Supports Direct Input compatible controllers
Additional:
Ultra Graphics Mode requires a 64-bit OS, at least 8GB of RAM, and 2GB VRAM.