FYI i know the issue has been resolved, this is just a Me Too. I have an old old Serial to USB cable that I bought with a TenTec receiver almost ten years ago. I never checked chipset or whatever, just connected it and it works on Win 7 & I had no problem with installing Prolific Drivers (u can find them anywhere online including Uniden Yahoo! groups files which is a great place to find any files by the way Join the groups)
I'd been fiddling and steaming out my ears trying to get a certain Serial to USB cable that I bought at Staples (not the one I already had all along, a new one I got) that turned out to be a special transmitting data kind that I could never get to work. All this time Ive had the cable I needed all along, connected to another receiver but I never plugged it in to see if it would. Thought I had to buy a "special kind" of cable to work with the Uniden- I didn't. Just any old cable will do, at least did in my case.