Hey mate, the best way is to do this.
Search in this section for the words nvidea compression. You should get a post from prathapml who made a nice .cmd file which will undo the nvidea compression.
Get the .exe and extract the files to a directory, put the cmd file inside with the files and run it. Now I recomend a structure like this for drivers,
D:\XPCD\$OEM$\$1\Drivers\009_Graphics\(all the files in here).
The reason for this is when you format and reinstall a PC, its best to install certain stuff before others. So have 001_chipset for chipset drivers etc. As you can see by 009_Graphics, i install my graphics card drivers last.
Then in winnt.sif put the lines:
OemPnPDriversPath="Drivers\001_Chipset;Drivers\009_graphics"
Basically you have to point to the folder with the .inf file in it. Seperate each directory with a semi colon ( ; ). I recomend this because its maintainable.
Using the compressor tool creates some problems. Some of the files it removes are needed for driver uninstallation, and windows complains that it cant uninstall devices.
Hope this helps. Once you have this task done, there is a space saving method, but you need to get this right first
Edit: 66.93 re still the latest WHQL forceware arnt they?