Windows XP or Windows Vista (though it runs on Windows 7, 10, and 11 via compatibility modes).

To run the original on PC, your system must meet the following hardware requirements. Note that these are significantly lower than modern titles like the 2016 Remaster or newer "Modern Warfare" reboots [2, 11, 15]. Minimum System Requirements

CoD 4’s system requirements were a in PC gaming history: accessible enough to become a cultural phenomenon, yet demanding enough to render the PS2/Xbox generation obsolete. It marked the shift from “will it run” to “how smoothly will it run.”

The minimum specs for Call of Duty 4 were designed for mid-range PCs of the mid-to-late 2000s. If your computer was built in the last decade, it will likely run the game without issue.