A method and system for storing a running image of an operating system on a removable operating system module. The module is first inserted into a first computer system. The operating system is installed on the first computer, an execution of the operating system is initiated, and a running image of the operating system is saved to the nonvolatile memory unit of the removable module. The removable module is removed from the first computer system and inserted into the second computer system where the running image of the operating system is loaded to a second memory accessible by the one or more processors included in the second computer system. The operating system is then executed by the processors. A user can update the operating system by connecting to a manufacturer's website and downloading an update or by sending the removable operating system module to the manufacturer for an update.