Mike,
Try hereX-Rite driver
Rich
I removed the X-Rite distribution CD from the drive, then downloaded the file at the above link and unpacked the archive to a temporary directory, then plugged in the X-Rite DTP 20 device.
The Found-new-hardware "wizard" appeared as before. I unchecked all possible locations to search, the idea being to let the "wizard" do the searching throughout the system. Clicked NEXT.
Eventually I saw the now-familiar notice about the driver not passing Windows Logo Testing. Clicked CONTINUE, as before (otherwise, no installation!). Eventually the "wizard" announced that the hardware was installed. The Pulse ColorElite software launched.
To see what would happen afterward, I then removed the USB device (via the "safely remove hardware" item in the system "tray") and physically unplugged it. Waited a moment. Plugged it in again. This time the "hardware wizard" didn't appear, nor the notice about the driver having failed to pass Windows Logo testing.
So this appears to have worked. If any of the above seems incorrect, please advise. The business about "Logo testing" seems strange -- as in, why would X-Rite not have updated its drivers to fix this problem...if in fact it is a problem (as opposed to a bogus error message).
Thanks again. Much appreciated.