So, I hope this will be helpful. I certainly have been through what you are going through. If it is a big PC manufacturer stock system, then the easiest thing to start with is to get on a machine that has internet capability (since your WiFi is knocked out without a driver) and go to the manufacturer's site and put in the exact model number and find all of the latest drivers for your PC & operating system, including the BIOS update if there is one. Do them one at a time. Usually this is better than the install disk as they have hopefully updated as needed. Some companies are better than others at having good working drivers ready to install.
If this doesn't work or you have already installed all of the drivers that the manufacturer has, then the next thing to try is a driver site like:
http://www.driverguide.com/
or
http://forums.windrivers.com/forum.php
Sadly, not all drivers, machines, or OSes are there or have all the drivers you may need.
The last thing to try is to use a program like Speccy
http://www.piriform.com/speccy
Then, after this program tells you in detail about each component, you can track down one at a time each driver for each component separately, which is not only a pain in the ass, but also will require a hope & prayer, because the hardware used on a particular manufacturer's machine might say it is a model ABCD, but there might be several versions out there which may need slightly different drivers. Let's hope you don't get involved in that minutia. If you can get that machine online, say with hardwired ethernet (assuming you have THAT driver), then maybe Windows Update will recognize it & install the right driver. Usually, though, if it is "unrecognized" in the Device Manager, Windows does not really understand exactly what it is or which driver it needs.
Good Luck!!!