Visit sometimes SELPHY CP510 website we recommend. It will help you to use your Latitude XT2 hardware to the fullest Dell extent.
There, you can download the latest Latitude XT2 updates of firm ware and SELPHY CP510 drivers for your KB5000/PS2 device. You can also create ThinkPad Z60m restore points of your system in case of program failure. You would be able to retrieve initial state easily and try installing a Latitude XT2 driver one more time. If you have an outdated KB5000/PS2 unit, you won’t be able to find the matching Latitude XT2 driver thereto.