The card reader shows up on a windows XP system as a HID (human interface device) compliant device Seems silly but unplug the reader, turn on the PC, get it fully booted into windows then plug it into a different USB port. a windows message should popup saying a new HID is found and in a few seconds load the driver. USB is like this it either needs to be hot plugged in to load the windows drivers or if drivers are required run the setup first. No setup nor drivers needed with win XP.