In order for you to play X3: Reunion on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows 10 / 8 / 7 / Vista / XP / 2000 / ME / 98SE
Processor (CPU):
Pentium IV 1.7GHz or same grade
Memory (RAM):
512MB RAM
Graphics Card:
128MB 3D card compatible with Direct X 9
DirectX®:
9
Hard Drive:
4.5GB available space