Embodiments efficiently replace an inbox driver of a computer with a third party driver. The inbox and third party drivers are function drivers configured to service an external device connected to the computer. A Function Loader driver is installed within the computer to enable replacement of the inbox function driver with the third party function driver based on a highest ranking of matching criteria. The Function Loader driver cooperates with a Function Loader Child driver, which intercepts a packet exchange that pertains to the external device to determine whether specified rules for replacement are satisfied. If so, the Function Loader Child driver modifies content of the packet exchange to uniquely identify the third party function driver as having the highest ranking of matching criteria. Accordingly, the operating system recognizes the third party function driver as a preferred driver for servicing the external device and installs the third party driver.