DirPCI is a simple lspci work-alike for Microwoft Windows (win32). It enumerates any PCI/PNP devices it can find on the system and looks up their respective IDs in the PCI ID Repository file (pci.ids, included). Any device without a class (ie. probably has no driver installed) is highlighted with a foreboding orange color.
tl;dr: this program tells you what hardware you've got installed so you can google for drivers.
Run "dirpci" in a console window. Any arguments will result in a help screen.
The output is arranged as follows: Bus:Device.Function [Class] Vendor Device (Subsystem)