"The Win7 PC reads other USB devices more or less OK"
Not sure what you mean by that- it either reads them or it doesn't surely?
Anyway, 2 things to try:
1. A powered USB hub
2. Shut down the PC. Connect the device. Power up the PC *with the device still connected*
I know you said that you have tried different USB cables. Does this include the cable that came with your reader? My Logitech remote will only connect with the USB cable which came along with it....
HTH
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