I just installed my car PC. I am using a Lilliput 619 which I bought here. Windows XP with service pack 2. The screen is coming on and working, but I can't get the touchscreen drivers installed properly. After installing the drivers, when I touch the screen it works, but it beeps and I can't touch the very bottom or top of screen. I have uninstalled and reinstalled the drivers several times. I have run thru the calibration and can click the bottom corners of the screen like the configuration requires, but still can't touch the bottom or top of the screen. Not sure what to do, please help.