Had to format/reinstall on a customer's Compaq desktop. Used the Compaq restore disks to reinstall o/s (XP home). When I installed the o/s I had a generic keyboard (ps2)hooked up and it worked fine. When I took it back to the customer's site, I hooked up the Compaq keyboard that came with the machine (usb). Driver would not load - gave an error saying something like "cannot install this file because it is already installed". OK, uninstalled the device, and downloaded the driver from the HP website and reinstalled. Same thing. The keyboard has a built in slot for memory cards (for digital cameras). But it seems the OEM hardware with the OEM software and the OEM driver should work!!! What else can I do? Customer is using a loaner keybord of mine right now.