After fiddling around with the driver for the BU-353 for several days, I called tech support. Was walked through a driver installation twice, and it still stumped the tech. "I'll have the engineers contact you, Henry..." was the reply. They did get back to me, and said their device doesn't work with WinXP 64 bit, even though originally they said it would.
It works great on my Tablet PC which runs straight WinXP, though.
It's a fine sensor, just too bad it's not supported on my main PC. The tech said the company would have to create a driver for WinXP 64 bit, and at this point I'm not going to hold my breath.