Project IGI 1 was designed for older Windows versions, so you may encounter compatibility issues on Windows 10. Here are some fixes:
Project IGI was released in 2000 and often suffers from lag, crashes, or black screens on modern hardware. Use these steps to fix performance: Playing a Classic Gem (IGI-1) in 2023 on Windows 10/11 project igi 1 download for windows 10
You can try downloading Project IGI 1 from other online sources, such as: Project IGI 1 was designed for older Windows