Thank you pvc for all your suggestions. I tried uninstalling the USB controllers as you suggested (There was only one “Host Controller” listed, so I uninstalled that one and left the USB root hub alone). After I restarted the computer the USB host controller reappeared in the device manager list. I then plugged the Hi-Pro into all three USB ports one after the other and got the same result that I had gotten before: The PC Com light on the Hi-Pro didn’t light up.
I re-ran the Hi-Pro 2 install CD in “Repair” mode. It said Hi-Pro found, firmware up to date, Hi-Pro ready for use. But without the PC Com light being illuminated I can’t get the Target software to connect to my hearing aids. When I tried to connect my hearing aids with Target, Target said, “Fitting device driver not installed” “Fitting device: NOAHLink”” Install the driver for your fitting device.” I never elected to use NOAHlink (at least not intentionally). There is no option in that dialog box to opt for a different fitting device other than NOAHlink. Maybe if Target doesn’t detect a Hi-Pro it defaults to NOAHlink, I don’t know.
I think my next step will have to be to try a computer repair shop at some time when I can be without my computer for a few days. Thank you again for your suggestions.