Unknown Devices, as the name suggests, helps you track down devices connected to your computer with yellow question marks in the Device Manager. In concert with the Device Manager’s own information, this program attempts to find out what exactly is connected to your computer. Note that you may need physical access to your case to open it up and get device numbers from motherboard card.
Program supports Win95, 98, 98se, Me, 2k, XP and 2003 but not NT. It also attempts to support future OSes. It runs fine from a CD or floppy. It’s free for personal and (especially) business use. The program contains no adware, spyware, malware, popups, or whatever is the latest name for junk software.