Hello, Sorry if posted in wrong place, don't know where this should go. I have this USB to serial cable, and I simply can't get it to work on my vista pc. Seems like such an easy plug, play, install and run device. Anyway.... I installed the latest drivers off their website, then plugged in the usb to serial cable to my pc. Drivers seemed to install without any problem. But then the IDE program I use wouldn't communicate with it properly. I borrowed a (different brand) usb-serial cable from a friend, it installed within 2 minutes and was working without any issues and connection worked just fine So I then uninstall the drivers for my pc, and then unplug the original cable (the one I own) then after replugging in and rebooting, reinstallation occurred as expected and I am soon presented with the following screenshot: and next to the appropriate icon in the device manager list, yellow exclamation mark error symbol appear and properties say this: Does anybody know what is wrong? Seems like INF file is broken, but I got no clue ??? NOTE: I tried the prolific drivers software off disc that came with cable, then found that <a href="http://www.prolific.com.tw/eng/downloads.asp?ID=31">their official website had newer version so tried that. I ended up as described above. Also, the inf file(s) that I discovered on my pc somewhere related to this device are attached in case anybody can figure out why this cable not working (please see my reply for the inf files' contents) Thank you very much.