I plug my pda into a USB port of my pc and the data transfer and battery
charging are working correctly. Today, I plug to another USB port on the
same pc. The pc treats it as a new device and asking for driver location.
It seems I need to reinstall it from the beginning. I switch back to the
port I previously used and everything works as normal. Can someone advise
why it happens and how to avoid repeat the installation of the drivers.

Thanks,

Ray