And you should confirm that there are MB drivers available either from the internet or a CD. Personally, I would not pursue this until I try specifically installing the FTDI drivers and seeing if that makes a difference. Often manufacturers have multiple separate drivers for MB Chipset, USB functionality, Audio, Network Adapters, etc.) These errors could have been present all along but just never noticed before, and MAY not affect solving the USB Serial Adapter installation task. If you (or someone else) built this PC from components, although windows CAN be installed without manufacturer specific motherboard drivers, not installing them during initial build, can result in messages such as these, until the proper MB drivers are installed. WARNING: if there are no other extraneous USB devices present, and you are seeing these entries, it is possible there are core USB device drivers missing from your PC that usually are included in manufacturer specific motherboard chipset drivers that need to be installed as well. After you confirm that you actually did try installing the FTDI driver, it would be interesting to know that if you right click and select 'Uninstall Device' then reboot your PC, does the 'Unknown USB Device' reappear, OR does it go away? BUT. Did you? Second, when you have device descriptor request errors as seen here, that indicates that some USB device(s) is/are not working currently. First, I didn't see an answer if you did try installing the FTDI Driver. I would suggest trying a little bit more on this adapter before giving up and buying another.
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