Systems and methods for trusted initialization of wagering game machines are described herein. In some embodiments, a method includes receiving, from a wagering game machine, a request for an operating system image that includes a first component for booting the wagering game machine. The method can also include transmitting the operating system image to the wagering game machine, wherein the operating system image also includes a second component for procuring software that authenticates content on the wagering game machine. Additionally, the method can include receiving a request for the software that authenticates content on the wagering game machine and transmitting the software that authenticates content on the wagering game machine.