Topic: Vendor ID file (PCI.id's)
This link hopefully will help you track down or identify the vendors of drivers you can't find.
(although Linux based the info could help you track down the actual Windows driver).
or example say my driver gives me the following info
PCI\VEN_1217&DEV_7120&SUBSYS_A00314FF&REV_01\4&3029DB9D&0&32F0
looking in the data base at the given site
I get 1217 O2 Micro, Inc
clicking on 1217 for dev 7120 i get 7120 Integrated MMC/SD Controller
Cheers
Jimbo