After install, the function Keys (other than F5) do not work per PC Doctor tests. All other keys and the mouse function as expected. I believe the problem is due to incorrect install. There have been other keyboards/mouse installed and the instructions for installing say all mouse and KB drivers (including preinstalled Ultraslim drivers) must be uninstalled before installing the Ultraslim drivers. But how do you do that? 1st problem is the drivers that had been installed and now their hardware removed, are no longer displayed by Device Manager so how do you find these drivers to uninstall? 2nd problem with all the driver uninstalled you no longer can communicate with the system. (Although it allows PS2 drivers to remain - there are no PS2 ports)? And finally how do you prevent PnP from reinstalling a driver before the user can run Ultraslim driver install program.