A few years ago I purchased MS Streets and Trips 2005. It came with a Pharos i360 GPS receiver. I have had a ball with this product. Since I travel a lot, it has helped me get from place to place quite easily with its integration into MS Streets and Trips.
Since I got it, I have upgraded the software MapPoint 2006 and recently to the RTM of Vista. With the Vista upgrade I could not get the reciever to be seen. Today I finally went out to Pharos site. I downloaded the USB drivers to reinstall. This did not work.
Thanks to a support technician, he directed me to the 64-bit drivers. I mentioned that I am only running on a 32-bit machine. He did not think it would make a difference since he has had it work for others. I'm set to confirm that it works and it even seems even more responsive when first plugged.
If you have this combination, give the site a try for the downloads.